723 results on '"Donea, A."'
Search Results
2. The first molecular investigation of Besnoitia besnoiti infections among cattle in Mosul, Iraq
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Alobaidii, Wasan Amjad, Abdullah, Donea Abdulrazak, Alkatab, Yahya Natiq Mohammed, Ali, Shahad Abbas, Ola-Fadunsin, Shola David, and Gimba, Fufa Ido
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- 2024
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3. Protective role of biosynthetic silver nanoparticles in broilers with aflatoxicosis through histopathological study of spleen
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Asseel M. Rahawi, Shahbaa Kh. Al-Taee, Fawwaz F. Ali, Omar Y. Altaey, and Donea A. Abdullah
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green biosynthesis ,nanoparticles ,descriptive analysis ,immunohistochemistry ,Veterinary medicine ,SF600-1100 - Abstract
Aflatoxin (AF) is considered a problematic issue in poultry farms. A novel bio-green synthesis nanoparticle technique is newly introduced in the poultry industry, thus this study aimed to investigate the harmful effects of aflatoxin on the histological structure of broilers' spleen as well as its toxicity on the immune system through the study of CD4+ and CD8+ expression and determination of the silver nitrate nanoparticles (AgNP) protective role against aflatoxin. Forty-five broiler chicks were divided into three groups. T1 control, T2 birds were treated with AF 70 ppb, and T3 birds were treated with AF and silver nanoparticles 150 ppm for 21 days. The result of histological examination in T2 revealed progressive pathological alteration in the red and white pulp with regressive pathological lesions in the splenic trabeculae and central artery sclerosis and white pulp regeneration with edema and congestion in T3. The descriptive chart analysis was used for pathological lesions, showing that the percentages for the red pulp in the three groups were 76, 71, and 73 and for the white pulp 24,29, and 27, respectively. Furthermore, there was a significant decrease of CD4+ and CD8+ expression in the splenic tissue of the broiler in T2 in contrast to T1 and T3. This study concluded that biosynthetic silver nanoparticles can reduce the histological effects and immunotoxicity of aflatoxin, and the descriptive and semi-quantity analysis of the histopathological lesions are essential modern methods in significantly evaluating the results of histological examination.
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- 2024
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4. Thermal and Non-Thermal Properties of Active Region Recurrent Coronal Jets
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Paraschiv, Alin R., Donea, Alina C., and Judge, Philip G.
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Astrophysics - Solar and Stellar Astrophysics ,Astrophysics - High Energy Astrophysical Phenomena - Abstract
We present observations of recurrent active region coronal jets and derive their thermal and non-thermal properties, by studying the physical properties of the plasma simultaneously at the base footpoint, and along the outflow of jets. The sample of analyzed solar jets were observed by SDO-AIA in Extreme Ultraviolet and by RHESSI in the X-Ray domain. The main thermal plasma physical parameters: temperature, density, energy flux contributions, etc. are calculated using multiple inversion techniques to obtain the differential emission measure from extreme-ultraviolet filtergrams. The underlying models are assessed, and their limitations and applicability are scrutinized. Complementarily, we perform source reconstruction and spectral analysis of higher energy X-Ray observations to further assess the thermal structure and identify non-thermal plasma emission properties. We discuss a peculiar penumbral magnetic reconnection site, which we previously identified as a ``Coronal Geyser''. Evidence supporting cool and hot thermal emission, and non-thermal emission, is presented for a subset of geyser jets. These active region jets are found to be energetically stronger than their polar counterparts, but we find their potential influence on heliospheric energetics and dynamics to be limited. We scrutinize whether the geyser does fit the non-thermal erupting microflare picture, finding that our observations at peak flaring times can only be explained by a combination of thermal and non-thermal emission models. This analysis of geysers provides new information and observational constraints applicable to theoretical modeling of solar jets., Comment: ApJ accepted for publication. 35 pages, 9 figures and 3 tables
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- 2022
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5. Thank You to Our 2023 Reviewers
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Graziella Caprarelli, David Baratoux, Cinzia Cervato, Paolo Diviacco, Alina Donea, Steven J. Fletcher, Chelle Gentemann, Helen M. Glaves, Jonathan H. Jiang, Cathleen E. Jones, Astrid Maute, Franklin P. Mills, Sara C. Pryor, Kristy Tiampo, and Zunyi Xie
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editorial ,peer review ,Astronomy ,QB1-991 ,Geology ,QE1-996.5 - Abstract
Abstract The Editors and Staff of Earth and Space Science thank the reviewers whose selfless work has significantly contributed to the publication process of papers highlighting the best research in geophysics, planetary, and space science in 2023. Peer‐reviewing is a demanding and thankless job. It is however an essential component of the scientific process, requiring the highest standards of integrity and rigor. Reviewers check data and procedures and test reproducibility of methods and results; they share their expertise to verify that the interpretations and conclusions of a paper are consistent with assumptions and existing knowledge. Without this essential work it would not be possible to trust in the scientific process. Publication of papers in a multidisciplinary journal such as Earth and Space Science, that highlights methods, instruments, data and algorithms, relies directly on the expertise of its reviewers to verify and vouch for the quality of the papers that are published. We are indebted to all our reviewers and are delighted to acknowledge them publicly in this Editorial.
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- 2024
- Full Text
- View/download PDF
6. Prevalence and haemato-biochemical alterations associated with Strongyloides papillosus infection among Awassi breed of sheep in Mosul, Iraq
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Alkateb, Yahya Natiq Mohammed, Abdullah, Donea Abdulrazak, Alobaidy, Abdulsatar Abdulrazaq Abdullah, Ola-Fadunsin, Shola David, and Gimba, Fufa Ido
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- 2023
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7. The Trigger Mechanism of Recurrent Solar Active Region Jets Revealed by the Magnetic Properties of a Coronal Geyser Site
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Paraschiv, Alin Razvan, Donea, Alina, and Leka, K. D.
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Astrophysics - Solar and Stellar Astrophysics ,Astrophysics - Instrumentation and Methods for Astrophysics - Abstract
Solar active region jets are small-scale collimated plasma eruptions that are triggered from magnetic sites embedded in sunspot penumbral regions. Multiple trigger mechanisms for recurrent jets are under debate. Vector magnetic field data from SDO-HMI observations are used to analyze a prolific photospheric configuration, identified in extreme ultraviolet observations as a `Coronal Geyser', that triggered a set of at least 10 recurrent solar active region jets. We focus on interpreting the magnetic fields of small-scale flaring sites aiming to understand the processes that govern recurrent jet eruptions. We perform a custom reprocessing of the SDO-HMI products, including disambiguation and uncertainty estimation. We scrutinized the configuration and dynamics of the photospheric magnetic structures. The magnetic configuration is described via the analysis of the photospheric magnetic vertical fields, to identify the process is responsible for driving the jet eruptions. We report that the two widely debated magnetic trigger processes, namely magnetic flux cancellation and magnetic flux emergence, appear to be responsible on a case by case basis for generating each eruption in our set. We find that 4 of 10 jets were due to flux cancellation while the rest were clearly not, and were more likely due to flux emergence., Comment: 19 pages, 6 figure, and 1 table. The Astrophysical journal, In press
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- 2020
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8. Observations of the 86 GHz SiO maser sources in the Central Parsec of the Galactic Centre
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Borkar, A., Eckart, A., Straubmeier, C., Sjouwerman, L. O., Karas, V., Kunneriath, D., Moser, L., Britzen, S., Valencia-S, M., Donea, A., and Zensus, A.
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Astrophysics - Astrophysics of Galaxies ,Astrophysics - Solar and Stellar Astrophysics - Abstract
We present results of 3 mm observations of SiO maser sources in the Galactic Centre (GC) from observations with the Australia Telescope Compact Array between $2010-2014$, along the transitions of the SiO molecule at $v = 1, J = 2-1$ at 86.243 GHz and $v = 2, J = 2-1$ at 85.640 GHz. We also present the results of the 3 mm observations with Atacama Large Millimeter/Submillimeter Array (ALMA). We detected 5 maser sources from the ATCA data, IRS 7, IRS 9, IRS 10EE, IRS 12N, and IRS 28; and 20 sources from the ALMA data including 4 new sources. These sources are predominantly late-type giants or emission line stars with strong circumstellar maser emission. We analyse these sources and calculate their proper motions. We also study the variability of the maser emission. IRS 7, IRS 12N and IRS 28 exhibit long period variability of the order of $1 - 2$ years, while other sources show steady increase or decrease in flux density and irregular variability over observation timescales. This behaviour is consistent with the previous observations., Comment: 22 pages, 5 figures, to be published in the proceedings of the XIII workshop on "Multifrequency Behaviour of High Energy Cosmic Sources - XIII - MULTIF2019", held on 3-8 June, 2019, in Palermo, Italy
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- 2019
9. On Solar Recurrent Coronal Jets: Coronal Geysers as Sources of Electron Beams and Interplanetary Type-III Radio Bursts
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Paraschiv, Alin Razvan and Donea, Alina
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Astrophysics - Solar and Stellar Astrophysics - Abstract
Coronal Jets are transitory small-scale eruptions omnipresent in solar observations. Active regions jets produce significant perturbations on the ambient solar atmosphere and are believed to be generated by microflare reconnection. Multiple sets of recurrent jets are identified in extreme-ultraviolet filter imaging. In this work we analyze the long time-scale recurrence of coronal jets originating from a unique footpoint structure observed in the lower corona. We report the detection of penumbral magnetic structures in the lower corona. These structures, that we entitled "Coronal Geysers", persist through multiple reconnection events that trigger recurrent jets in a quasi-periodical trend. Recurrent jet eruptions have been associated with Type-III radio bursts that are manifestations of traveling non-thermal electron beams.We examine the assumed link, as the coronal sources of interplanetary Type-III bursts are still open for debate. We scrutinized the hypothesized association by temporally correlating a statistically significant sample of six Geyser structures, that released at least 50 recurrent jets, with correspondent Type-III radio bursts detected in the interplanetary medium. Data analysis of these phenomena provides new information towards understanding of small-scale reconnection, non-thermal electron beam acceleration, and energy release. We find that the penumbral Geyser-like flaring structures produce recurring jets. They can be long-lived, quasi-stable, and act as coronal sources for Type-III bursts and implicitly for upwards accelerated electron beams., Comment: 18 pages, 5 figures and 1 table. APJ Accepted
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- 2019
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10. Epidemiological studies of gastrointestinal parasites infecting dogs in Kwara Central, North Central, Nigeria
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Ola-Fadunsin, Shola David, Abdulrauf, Aminat Bisola, Abdullah, Donea Abdulrazak, Ganiyu, Isau Aremu, Hussain, Karimat, Sanda, Idiat Modupe, Rabiu, Musa, and Akanbi, Olatunde Babatunde
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- 2023
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11. تأثير التعلم التبادلي بأسلوبي التمرين المتغير والثابت في تعلم بعض المهارات الأساسية الهجومية بكرة السلة
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Donea Ali
- Subjects
التمرين ,الثابت ,Sports ,GV557-1198.995 - Abstract
ان العملية التعليمية شغلت بال الكثيرمن الباحثين والمختصين في مجال التعلم والتعليم، وبما ان المدرس هو أحد الاركان الاساسية التي تستند عليها عملية التعليم فأن المدرس الناجح هو الذي يحاول ايجاد أفضل الطرق بحيث تتناسب وقدرات ومستوى الطلبةوتكمن أهمية البحث بأستخدام التعلم التبادلي بأسلوب التمرين المتغير والثابت في تعليم بعض المهارات الاساسية الهجومية بكرة السلة, لكي يسهم في تقديم أسلوب تعليمي جديد يساعد على رفع مستوى تعلم الطلبة لمهارات لعبة كرة السلة ضمن المنهج المقرر.اما مشكلة البحث بالرغم مما توصلت اليه البحوث من نتائج مثمرة على صعيد استخدام طرائق التعليم المختلفة ما زالت العملية التعليمية في قطرنا وخصوصاً في تعليم المهارات الحركية تعتمد على اساليب تعليمية محددة (الاسلوب الامري)لم تضع في نظرها خصوصية كل مهارة ومستوى صعوبتها وطريقة تعلمها لذا فقد ارتأت الباحثة الى استخدام طرق واساليب اخرى في التعليم ومنها استخدام طريقة التعلم التبادلي بأسلوبي التمرين المتغير والثابت من اجل تحسين تعلم بعض المهارات الاساسية الهجومية بكرة السلة بدلا من الاعتماد على الاسلوب الامري فقط
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- 2023
12. Thank You to Our 2022 Reviewers
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Graziella Caprarelli, Ilkay Altintas, David Baratoux, Cinzia Cervato, Paolo Diviacco, Alina Donea, Andrea Donnellan, Chelle Gentemann, Helen M. Glaves, Jonathan H. Jiang, Cathleen E. Jones, Astrid Maute, Franklin P. Mills, Benoit Pirenne, Sara C. Pryor, Kristy Tiampo, and Zunyi Xie
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Astronomy ,QB1-991 ,Geology ,QE1-996.5 - Published
- 2023
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13. Are all flare ribbons simply connected to the corona?
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Judge, Philip, Paraschiv, Alin, Lacatus, Daniela, Donea, Alina, and Lindsey, Charlie
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Astrophysics - Solar and Stellar Astrophysics - Abstract
We consider the observational basis for the belief that flare ribbons in the chromosphere result from energy transport from the overlying corona. We study ribbons of small flares using magnetic as well as intensity data from the Hinode, SDO and IRIS missions. While most ribbons appear connected to the corona, and they over-lie regions of significant vertical magnetic field, we examine one ribbon with no clear evidence for such connections. Evolving horizontal magnetic fields seen with Hinode suggest that reconnection with pre-existing fields below the corona can explain the data. The identification of just one, albeit small, ribbon, with no apparent connection to the corona, leads us to conclude that at least two mechanisms are responsible for the heating that leads to flare ribbon emission.
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- 2017
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14. An explanation of remarkable emission line profiles in post-flare coronal rain
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Lacatus, Daniela, Judge, Philip, and Donea, Alina
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Astrophysics - Solar and Stellar Astrophysics - Abstract
We study broad red-shifted emission in chromospheric and transition region lines that appears to correspond to a form of post-flare coronal rain. Profiles of Mg II, C II and Si IV lines were obtained using the IRIS instrument before, during and after the X2.1 flare of 11 March 2015 (SOL2015-03- 11T16:22). We analyze the profiles of the five transitions of Mg II (the 3p - 3s h and k transitions, and three lines belonging to the 3d - 3p transitions). We use analytical methods to understand the unusual profiles, together with higher resolution observational data of similar phenomena observed by Jing et al. (2016). The peculiar line ratios indicate anisotropic emission from the strands which have cross-strand line center optical depths (k-line) of between 1 and 10. The lines are broadened by unresolved Alfvenic motions whose energy exceeds the radiation losses in the Mg II lines by an order of magnitude. The decay of the line widths is accompanied by a decay in the brightness, suggesting a causal connection. If the plasma is <~ 99% ionized, ion-neutral collisions can account for the dissipation, otherwise a of dynamical process seems necessary. Our work implies that the motions are initiated during the impulsive phase, to be dissipated as radiation over a period of an hour, predominantly by strong chromospheric lines. The coronal "rain" we observe is far more turbulent that most earlier reports have indicated, with implications for plasma heating mechanisms.
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- 2017
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15. Novel Approach to Forecasting Photospheric Emergence of Active Regions
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S. S. A. Silva, M. Lennard, G. Verth, I. Ballai, E. L. Rempel, J. Warnecke, H. Iijima, H. Hotta, S.-H. Park, A. C. Donea, K. Kusano, and V. Fedun
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Solar magnetic flux emergence ,Solar active region velocity fields ,Solar convective zone ,Astrophysics ,QB460-466 - Abstract
One key aspect of understanding the solar dynamo mechanism and the evolution of solar magnetism is to properly describe the emergence of solar active regions. In this Letter, we describe the Lagrangian photospheric flows dynamics during a simulated flux emergence that produces an active region formed by pores. We analyze the lower photospheric flow organization prior, during and following the rise of an active region, uncovering the repelling and attracting photospheric structures that act as sources and sinks for magnetic element transport. Our results show that around 10 hr before the simulated emergence, considerable global changes are taking place on mesogranular scales indicated by an increase of the number of regions acting as a source to the multiple and scattered emergences of small-scale magnetic flux. At the location of active region’s appearance, the converging flows become weaker and there is an arising of a diverging region 8 hr before the emergence time. Our study also indicates that the strong concentration of magnetic field affects the flow dynamics beyond the area of the actual simulated pores, leading to complex and strongly diverging flows in the neighboring regions. Our findings suggest that the Lagrangian analysis is a powerful tool to describe the changes in the photospheric flows due to magnetic flux emergence.
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- 2023
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16. Large-scale testing at the ELSA reaction wall in support of Eurocode 8
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Donea, J., primary, Magomette, G., additional, Negro, P., additional, Pegon, P., additional, Pinto, A.V., additional, and Verzeletti, G., additional
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- 2022
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17. Outcomes of patients with heart failure with preserved ejection fraction discharged on treatment with neurohormonal antagonists after an episode of decompensation
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Tost, Josep, Llorens, Pere, Cotter, Gad, Davison, Beth, Jacob, Javier, Gil, Víctor, Herrero, Pablo, Martín-Sánchez, Francisco Javier, Donea, Ruxandra, Rodríguez, Beatriz, Lucas-Imbernon, Francisco Javier, Andueza, Juan Antonio, Mecina, Ana Belén, Torres-Gárate, Raquel, Piñera, Pascual, Alquézar-Arbé, Aitor, Espinosa, Begoña, Mebazaa, Alexandre, Chioncel, Ovidiu, and Miró, Òscar
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- 2021
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18. Monitoring the Galactic Centre with Australia Telescope Compact Array
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Borkar, A., Eckart, A., Straubmeier, C., Kunneriath, D., Jalali, B., Sabha, N., Shahzamanian, B., García-Marín, M., Valencia-S, M., Sjouwerman, L., Britzen, S., Karas, V., Dovčiak, M., Donea, A., and Zensus, A.
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Astrophysics - Astrophysics of Galaxies ,Astrophysics - High Energy Astrophysical Phenomena - Abstract
The supermassive black hole, Sagittarius A* (Sgr A*), at the centre of the Milky Way undergoes regular flaring activity which is thought to arise from the innermost region of the accretion flow. We performed the monitoring observations of the Galactic Centre to study the flux-density variations at 3mm using the Australia Telescope Compact Array (ATCA) between 2010 and 2014. We obtain the light curves of Sgr A* by subtracting the contributions from the extended emission around it, and the elevation and time dependent gains of the telescope. We perform structure function analysis and the Bayesian blocks representation to detect flare events. The observations detect six instances of significant variability in the flux density of Sgr A* in three observations, with variations between 0.5 to 1.0 Jy, which last for 1.5 $-$ 3 hours. We use the adiabatically expanding plasmon model to explain the short time-scale variations in the flux density. We derive the physical quantities of the modelled flare emission, such as the source expansion speed $v_{\mathrm{exp}}$, source sizes, spectral indices, and the turnover frequency. These parameters imply that the expanding source components are either confined to the immediate vicinity of Sgr A* by contributing to the corona or the disc, or have a bulk motion greater than $v_{\mathrm{exp}}$. No exceptional flux density variation on short flare time-scales was observed during the approach and the flyby of the dusty S-cluster object (DSO/G2). This is consistent with its compactness and the absence of a large bow shock., Comment: 15 pages, 24 figures
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- 2016
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19. On Mode Conversion, Reflection and Transmission of Magneto-Acoustic Waves from Above in an Isothermal Stratified Atmosphere
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Hansen, Shelley, Cally, Paul, and Donea, Alina
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Astrophysics - Solar and Stellar Astrophysics - Abstract
We use the exact solutions for magnetoacoustic waves in a two dimensional isothermal atmosphere with uniform inclined magnetic field to calculate the wave reflection, transmission, and conversion of slow and fast waves incident from above ($z=\infty$). This is relevant to the question of whether waves excited by flares in the solar atmosphere can penetrate the Alfv\'en/acoustic equipartition layer (which we identify as the canopy) to reach the photosphere with sufficient energy to create sunquakes. It is found that slow waves above the acoustic cutoff frequency efficiently penetrate (transmit) as acoustic (fast) waves if directed at a small attack angle to the magnetic field, with the rest converting to magnetic (slow) waves, in accord with Generalized Ray Theory. This may help explain the compact nature of seismic sources of sunquakes identified using seismic holography. The incident slow waves can also efficiently transmit at low frequency in inclined field due to the reduction in acoustic cutoff frequency (ramp effect). Incident fast (magnetic) "waves" from infinity with specified nonzero horizontal wavenumber are necessarily evanescent, but can carry energy to the equipartition level by tunnelling. It is found that this can then efficiently convert to acoustic (fast) energy that can again reach the photosphere as a travelling wave. Overall, there appear to be ample avenues for substantial compressive wave energy to penetrate the canopy and impact the photosphere., Comment: 15 pages, 6 figures: accepted for publication in MNRAS
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- 2015
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20. The molecular prevalence, distribution and risk factors associated with Babesia bigemina infection in Peninsular Malaysia
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Ola-Fadunsin, Shola David, Sharma, Reuben Sunil Kumar, Abdullah, Donea Abdurazak, Gimba, Fufa Ido, Abdullah, Faez Firdaus Jesse, and Sani, Rehana Abdullah
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- 2021
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21. Thank You to Our 2023 Reviewers
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Caprarelli, Graziella, Baratoux, David, Cervato, Cinzia, Diviacco, Paolo, Donea, Alina, Fletcher, Steven J., Gentemann, Chelle, Glaves, Helen M., Jiang, Jonathan H., Jones, Cathleen E., Maute, Astrid, Mills, Franklin P., Pryor, Sara C., Tiampo, Kristy, Xie, Zunyi, Caprarelli, Graziella, Baratoux, David, Cervato, Cinzia, Diviacco, Paolo, Donea, Alina, Fletcher, Steven J., Gentemann, Chelle, Glaves, Helen M., Jiang, Jonathan H., Jones, Cathleen E., Maute, Astrid, Mills, Franklin P., Pryor, Sara C., Tiampo, Kristy, and Xie, Zunyi
- Abstract
The Editors and Staff of Earth and Space Science thank the reviewers whose selfless work has significantly contributed to the publication process of papers highlighting the best research in geophysics, planetary, and space science in 2023. Peer-reviewing is a demanding and thankless job. It is however an essential component of the scientific process, requiring the highest standards of integrity and rigor. Reviewers check data and procedures and test reproducibility of methods and results; they share their expertise to verify that the interpretations and conclusions of a paper are consistent with assumptions and existing knowledge. Without this essential work it would not be possible to trust in the scientific process. Publication of papers in a multidisciplinary journal such as Earth and Space Science, that highlights methods, instruments, data and algorithms, relies directly on the expertise of its reviewers to verify and vouch for the quality of the papers that are published. We are indebted to all our reviewers and are delighted to acknowledge them publicly in this Editorial.
- Published
- 2024
22. Enhanced Acoustic Emission in Relation to the Acoustic Halo Surrounding Active Region 11429
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Hanson, Chris S., Donea, Alina C., and Leka, K. D.
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Astrophysics - Solar and Stellar Astrophysics - Abstract
The use of acoustic holography in the high-frequency $p$-mode spectrum can resolve the source distributions of enhanced acoustic emissions within halo structures surrounding active regions. In doing so, statistical methods can then be applied to ascertain relationships with the magnetic field. This is the focus of this study. The mechanism responsible for the detected enhancement of acoustic sources around solar active regions has not yet been explained. Furthermore the relationship between the magnetic field and enhanced acoustic emission has not yet been comprehensively examined. We have used vector magnetograms from the \Helioseismic and Magnetic Imager (HMI) on-board the Solar Dynamics Observatory (SDO) to image the magnetic-field properties in the halo. We have studied the acoustic morphology of an active region, with a complex halo and "glories," and we have linked some acoustic properties to the magnetic-field configuration. In particular, we find that acoustic sources are significantly enhanced in regions of intermediate field strength with inclinations no different from the distributions found in the quiet Sun. Additionally we have identified a transition region between the active region and the halo, in which the acoustic source power is hindered by inclined fields of intermediate field strength. Finally, we have compared the results of acoustic emission maps, calculated from holography, and the commonly used local acoustic maps, finding that the two types of maps have similar properties with respect to the magnetic field but lack spatial correlation when examining the highest-powered regions., Comment: 19 pages, 8 figures, Accepted by Solar Physics
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- 2015
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23. Molecular detection, prevalence and risk factors of Theileria orientalis infection among cattle in Peninsular Malaysia
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Ola-Fadunsin, Shola David, Sharma, Reuben Sunil Kumar, Abdullah, Donea Abdurazak, Gimba, Fufa Ido, Jesse, Faez Firdaus Abdullah, and Sani, Rehana Abdullah
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- 2020
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24. Three-dimensional Magnetic Restructuring in Two Homologous Solar Flares in the Seismically Active NOAA AR 11283
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Liu, Chang, Deng, Na, Lee, Jeongwoo, Wiegelmann, Thomas, Jiang, Chaowei, Dennis, Brian R., Su, Yang, Donea, Alina, and Wang, Haimin
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Astrophysics - Solar and Stellar Astrophysics - Abstract
We carry out a comprehensive investigation comparing the three-dimensional magnetic field restructuring, flare energy release, and the helioseismic response, of two homologous flares, the 2011 September 6 X2.1 (FL1) and September 7 X1.8 (FL2) flares in NOAA AR 11283. In our analysis, (1) a twisted flux rope (FR) collapses onto the surface at a speed of 1.5 km/s after a partial eruption in FL1. The FR then gradually grows to reach a higher altitude and collapses again at 3 km/s after a fuller eruption in FL2. Also, FL2 shows a larger decrease of the flux-weighted centroid separation of opposite magnetic polarities and a greater change of the horizontal field on the surface. These imply a more violent coronal implosion with corresponding more intense surface signatures in FL2. (2) The FR is inclined northward, and together with the ambient fields, it undergoes a southward turning after both events. This agrees with the asymmetric decay of the penumbra observed in the peripheral regions. (3) The amounts of free magnetic energy and nonthermal electron energy released during FL1 are comparable to those of FL2 within the uncertainties of the measurements. (4) No sunquake was detected in FL1; in contrast, FL2 produced two seismic emission sources S1 and S2 both lying in the penumbral regions. Interestingly, S1 and S2 are connected by magnetic loops, and the stronger source S2 has weaker vertical magnetic field. We discuss these results in relation to the implosion process in the low corona and the sunquake generation., Comment: 12 pages, 9 figures, accepted to the Astrophysical Journal
- Published
- 2014
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25. On the Origin of a Sunquake during the 29 March 2014 X1 Flare
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Judge, Philip G., Kleint, Lucia, Donea, Alina, Dalda, Alberto Sainz, and Fletcher, Lyndsay
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Astrophysics - Solar and Stellar Astrophysics - Abstract
Helioseismic data from the HMI instrument have revealed a sunquake associated with the X1 flare SOL2014-03-29T17:48 in active region NOAA 12017. We try to discover if acoustic-like impulses or actions of the Lorentz force caused the sunquake. We analyze spectro-polarimetric data obtained with the Facility Infrared Spectrometer (FIRS) at the Dunn Solar Telescope (DST). Fortuitously the FIRS slit crossed the flare kernel close to the acoustic source, during the impulsive phase. The infrared FIRS data remain unsaturated throughout the flare. Stokes profiles of lines of Si I 1082.7 nm and He I 1083.0 nm are analyzed. At the flare footpoint, the Si I 1082.7 nm core intensity increases by a factor of several, the IR continuum increases by 4 +/- 1%. Remarkably, the Si I core resembles the classical Ca II K line's self-reversed profile. With nLTE radiative models of H, C, Si and Fe these properties set the penetration depth of flare heating to 100 +/- 100 km, i.e. photospheric layers. Estimates of the non-magnetic energy flux are at least a factor of two less than the sunquake energy flux. Milne-Eddington inversions of the Si I line show that the local magnetic energy changes are also too small to drive the acoustic pulse. Our work raises several questions: Have we "missed" the signature of downward energy propagation? Is it intermittent in time and/or non-local? Does the 1-2 s photospheric radiative damping time discount compressive modes?, Comment: in press
- Published
- 2014
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26. Observing the Sun with the Murchison Widefield Array
- Author
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Oberoi, D., Sharma, R., Bhatnagar, S., Lonsdale, C. J., Matthews, L. D., Cairns, I. H., Tingay, S. J., Benkevitch, L., Donea, A., White, S. M., Bernardi, G., Bowman, J. D., Briggs, F., Cappallo, R. J., Corey, B. E., Deshpande, A., Emrich, D., Gaensler, B. M., Goeke, R., Greenhill, L. J., Hazelton, B. J., Johnston-Hollitt, M., Kaplan, D. L., Kasper, J. C., Kratzenberg, E., Lynch, M. J., McWhirter, S. R., Mitchell, D. A., Morales, M. F., Morgan, E., Offringa, A. R., Ord, S. M., Prabu, T., Rogers, A. E. E., Roshi, A., Salah, J. E., Shankar, N. Udaya, Srivani, K. S., Subrahmanyan, R., Waterson, M., Wayth, R. B., Webster, R. L., Whitney, A. R., William, A., and Williams, C. L.
- Subjects
Astrophysics - Instrumentation and Methods for Astrophysics ,Astrophysics - Solar and Stellar Astrophysics - Abstract
The Sun has remained a difficult source to image for radio telescopes, especially at the low radio frequencies. Its morphologically complex emission features span a large range of angular scales, emission mechanisms involved and brightness temperatures. In addition, time and frequency synthesis, the key tool used by most radio interferometers to build up information about the source being imaged is not effective for solar imaging, because many of the features of interest are short lived and change dramatically over small fractional bandwidths. Building on the advances in radio frequency technology, digital signal processing and computing, the kind of instruments needed to simultaneously capture the evolution of solar emission in time, frequency, morphology and polarization over a large spectral span with the requisite imaging fidelity, and time and frequency resolution have only recently begun to appear. Of this class of instruments, the Murchison Widefield Array (MWA) is best suited for solar observations. The MWA has now entered a routine observing phase and here we present some early examples from MWA observations., Comment: 4 pages, 3 figures, submitted for the 31st URSI General Assembly and Scientific Symposium, to be held in Bejing, China from 16-23, August, 2014
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- 2014
27. Clinical signs, prevalence, and hematobiochemical profiles associated with Anaplasma infections in sheep of North Iraq
- Author
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Donea Abdulrazak Abdullah, Fawwaz Fadhil Ali, Afrah Younis Jasim, Shola David Ola-Fadunsin, Fufa Ido Gimba, and Moeena Sadeq Ali
- Subjects
anaplasma species ,biochemical ,hematological ,prevalence ,sheep ,Animal culture ,SF1-1100 ,Veterinary medicine ,SF600-1100 - Abstract
Background and Aim: Anaplasma infection is a worldwide prevalent condition that causes significant economic losses in affected flocks. This study was conducted to determine the prevalence and clinical signs associated with ovine anaplasmosis as well as the hematological and biochemical changes associated with the disease in natural infection in North Iraq. Materials and Methods: A total of 420 sheep were appropriately examined, and the clinical signs were documented accordingly. Blood samples were collected and subjected to parasitological, hematological, and biochemical analyses. Results: Anaplasma-infected sheep displayed the following clinical signs: Paleness of the mucous membrane, bloody diarrhea, emaciation, pyrexia, jaundice, nasal discharge, coughing, loss of wool, nervous signs, hemoglobinuria, and lacrimation. The prevalence of Anaplasma infection was 66.19%, and female sheep were significantly (p
- Published
- 2020
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28. DIGESTIVE HEMORRHAGE IN PEDIATRICS – DIAGNOSTIC CHALLENGES IN A SMALL TODDLER WITH MECKEL’S DIVERTICULUM
- Author
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Smaranda Diaconescu, Ana-Maria Scurtu, Lorenza Donea, Andreea Nechita, Oana-Maria Rosu, Gabriela Ghiga, Nicoleta Gimiga, and Silvia Strat
- Subjects
children ,endoscopy ,hemorrhage ,meckel's diverticulum ,Dentistry ,RK1-715 - Abstract
Digestive hemorrhage among the pediatric population is one of the most important causes of addressability to pediatric emergency medical services, being, due to its complexity, a real challenge for the clinician. Precise and early diagnosis and therapeutic conduct are life-saving. We present a case of Meckel’s diverticulum in a 9-month-old male infant with a history of upper gastrointestinal bleeding exteriorized as hematemesis 2 month prior to current admission. The recurrence of melena with posthemorhagic severe anemia imposed an upper digestive endoscopy that did not identify active sources of bleeding or stigmas of recent bleeding. The suspicion of a Meckel’s diverticulum was raised and scintigraphy was recommended but as the infant’s general condition deteriorates, surgery was required. Intraoperatively, the presence of a Meckel diverticulum with umbilical adhesions is noticeable.
- Published
- 2020
29. Pompe disease, a late-onset – misleading form of diagnosis in a patient with persistent hepatic cytolysis syndrome
- Author
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Smaranda Diaconescu, Cristina Rusu, Laura Bozomitu, Alina Costina Luca, Ecaterina Vlad, Oana-Larisa Ciobanu-Matei, Ramona Babici, Silvia Strat, and Lorenza Donea
- Subjects
pompe disease ,brothers ,hepatocytolysis ,Medicine ,Pediatrics ,RJ1-570 - Abstract
The article discusses a clinical case of late-onset Pompe disease in a 15-year and 6-month-old adolescent hospitalised in a Paediatric Gastroenterology department to investigate persistent liver cytolysis, without response to hepatoprotective therapy. After excluding viral, autoimmune, metabolic and toxic drug aetiologies, a storage disease was suspected and imposed biochemical and genetic tests which confirmed a type II glycogenosis (Pompe disease), both by α-glucosidase (GAA) deficiency, as well as by the identification of two gene mutations on 17q25.2-q25.3 chromosome.
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- 2020
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30. Boala Pompe forma tardivă – capcană de diagnostic la un pacient cu sindrom de citoliză hepatică persistent
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Smaranda Diaconescu, Cristina Rusu, Laura Bozomitu, Alina Costina Luca, Ecaterina Vlad, Oana-Larisa Ciobanu-Matei, Ramona Babici, Silvia Strat, and Lorenza Donea
- Subjects
boală pompe ,frați ,hepatocitoliză ,Medicine ,Pediatrics ,RJ1-570 - Abstract
Articolul pune în discuţie un caz clinic de boală Pompe forma tardivă la un adolescent în vârstă de 15 ani și 6 luni, internat într-un serviciu de gastroenterologie pediatrică pentru investigarea unei citolize hepatice persistente, fără răspuns la terapia hepatoprotectoare. După excluderea etiologiilor virale, autoimune, metabolice și toxic medicamentoase, s-a suspectat o boală de stocaj, motiv pentru care s-au efectuat teste biochimice şi genetice cu confirmarea glicogenozei tip II (boala Pompe), atât la nivel enzimatic prin deficit al α-glucozidazei (GAA), cât și prin identificarea a două mutații genice aflate pe cromozomul 17q25.2-q25.3.
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- 2020
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31. Prevalence and climatic influence on hemoparasites of cattle and sheep in Mosul, Iraq
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Donea Abdulrazak Abdullah, Moeena Sadeq Ali, Sanaa Gazei Omer, Shola David Ola-Fadunsin, Fawwaz Fadhil Ali, and Fufa Ido Gimba
- Subjects
cattle ,climatic factors ,hemoparasites ,mosul ,prevalence ,sheep ,Veterinary medicine ,SF600-1100 - Abstract
Objective: Hemoparasitism is a condition commonly found in animals and it exerts negatively on the health, production, reproduction, and performance of the affected animals. This study is aimed at determining the prevalence of different hemoparasites affecting cattle and sheep in Mosul, Iraq, and to deduce the effect of climatic factors on the occurrence of these hemoparasites. Materials and Methods: Blood samples from cattle and sheep that were submitted to the Parasitology Laboratory of the Veterinary Hospital of Ninavah between 2008 and 2018 were examined for the presence of blood parasites using the thin blood smear preparation. Data were analyzed using percentages (%), tabulations, and graphs. Spearmans rank correlation coefficient was used to measure the strength of association between the occurrence of hemoparasites of cattle/sheep and each climatic variable. Results: Anaplasma spp. Babesia spp. and Theileria spp. were the hemoparasites detected among cattle and sheep in the study, with Theileria spp. been the most prevalent among cattle, while Anaplasma spp. was the most prevalent among sheep. There was no distinct pattern in the yearly and monthly prevalence of these hemoparasites among cattle and sheep. Rainfall and relative humidity negatively influenced the occurrence of hemoparasites infections, while temperature favored their occurrences. Conclusion: This study appears to be the first to evaluate the correlation between climatic vari¬ables and the prevalence of hemoparasites of cattle and sheep in Mosul, Iraq. Climatic variables influenced the abundance of hemoparasites of cattle and sheep in the study area. The outcome of this study will add to the existing knowledge on the effect of climatic factors on the occurrence of parasitic diseases of ruminants in Middle East. [J Adv Vet Anim Res 2019; 6(4.000): 492-498]
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- 2019
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32. RETRACTED ARTICLE: Molecular Prevalence and Epidemiology of Trypanosoma evansi Among Cattle in Peninsular Malaysia
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Ola-Fadunsin, Shola David, Gimba, Fufa Ido, Abdullah, Donea Abdurazak, Abdullah, Faez Jesse Firdaus, and Sani, Rehana Abdullah
- Published
- 2020
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33. Statistics of Local Seismic Emission from the Solar Granulation
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Lindsey, Charles and Donea, Alina
- Subjects
Astrophysics - Solar and Stellar Astrophysics - Abstract
We apply computational seismic holography to high-frequency helioseismic observations of the quiet Sun from SDO/HMI to locate predominant sources of seismic emission with respect to the structure of the solar granulation. The regions of greatest seismic emission are the edges of photospheric granules. Seismic emission from regions whose continuum brightnesses are 95-100% of the mean, as resolved by HMI, are about 2.5 times as emissive as regions whose brightnesses are 100-104% of the mean. The greater seismic emissivity from regions whose brightnesses are somewhat less than the mean is roughly in line with expectations from an understanding that attributes most seismic emission to cool plumes plummeting from the edges of granules. However, seismic emission from regions whose continuum brightnesses significantly exceed 104% of the mean is also remarkably high. This unexpected feature of high-frequency seismic emission from the solar granulation begs to be understood., Comment: 6 pages, published, Eclipse on the Coral Sea: Cycle 24 Ascending (GONG 2012, LWS/SDO-5, and SOHO 27) IOP Publishing Journal of Physics: Conference Series 440 (2013) 012044
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- 2013
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34. Enhanced sources of acoustic power surrounding AR11429
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Donea, Alina and Hanson, Christopher
- Subjects
Astrophysics - Solar and Stellar Astrophysics - Abstract
Multi-frequency power maps of the local acoustic oscillations show acoustic enhancements (\acoustic-power halos") at high frequencies surrounding large active region. Computational seismic holography reveals a high-frequency \acoustic-emission halo", or \seismic glory" surrounding large active regions. In this study, we have applied computational seismic holography to map the seismic seismic source density surrounding AR 11429. Studies of HMI/SDO Doppler data, shows that the "acoustic halos" and the "seismic glories" are prominent at high frequencies 5-8 mHz. We investigate morphological properties of acoustic-power and acoustic emission halos around an active region to see if they are spatially correlated. Details about the local magnetic field from vectormagnetograms of AR 11429 are included. We identify a 15" region of seismic deficit power (dark moat) shielding the white-light boundary of the active region. The size of the seismic moat is related to region of intermediate magnetic field strength. The acoustic moat is circled by the halo of enhanced seismic amplitude as well as enhanced seismic emission. Overall, the results suggest that features are related. However, if we narrow the frequency band to 5.5-6.5 mHz, we find that the seismic source density dominates over the local acoustic power, suggesting the existence of sources that emit more energy downward into the solar interior than upward toward the solar surface., Comment: 10 pages, published, Journal of Physics: Conference Series Volume 440 conference 2013 J. Phys.: Conf. Ser. 440 012028
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- 2013
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35. The Role of Magnetic Fields in Transient Seismic Emission Driven by Atmospheric Heating in Flares
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Lindsey, C., Donea, A. -C., Oliveros, J. C. Martinez, and Hudson, H. S.
- Subjects
Astrophysics - Solar and Stellar Astrophysics - Abstract
The physics of transient seismic emission in flares remains largely mysterious. Its discoverers proposed that these "sunquakes" are the signature of a shock driven by "thick-target heating" of the flaring chromosphere. H-{\alpha} observations show evidence for such a shock. However, simulations of shocks driven by impulsive chromospheric heating show withering radiative losses as the shock proceeds downward. The compression of the shocked gas heats and increases its density, making it more radiative. So, radiative losses increase radically with the strength of the shock. This has introduced doubt that sufficient energy from such a shock can penetrate into the solar interior to match that indicated by the helioseismic signatures. We point out that simulations of acoustic transients driven by impulsive heating have no account for magnetic fields characteristic of transient-seismic-source environments. These must have a major impact on the seismic flux conducted into the solar interior. A strong horizontal magnetic field, for example, greatly increases the compressional modulus of the chromospheric medium. This greatly reduces compression of the gas, hence the radiative losses as the transient passes through it. This could explain the strong affinity of seismic sources to regions of strong, highly inclined penumbral magnetic fields. The role of inclined magnetic fields, then, is fundamental to our understanding of the role of impulsive heating in transient seismic emission., Comment: 16 pages, 4 figures, submitted to Solar Physics
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- 2013
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36. The Murchison Widefield Array: solar science with the low frequency SKA Precursor
- Author
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Tingay, S. J., Oberoi, D., Cairns, I., Donea, A., Duffin, R., Arcus, W., Bernardi, G., Bowman, J. D., Briggs, F., Bunton, J. D., Cappallo, R. J., Corey, B. E., Deshpande, A., deSouza, L., Emrich, D., Gaensler, B. M., Goeke, R., Greenhill, L. J., Hazelton, B. J., Herne, D., Hewitt, J. N., Johnston-Hollitt, M., Kaplan, D. L., Kasper, J. C., Kennewell, J. A., Kincaid, B. B., Koenig, R., Kratzenberg, E., Lonsdale, C. J., Lynch, M. J., McWhirter, S. R., Mitchell, D. A., Morales, M. F., Morgan, E., Ord, S. M., Pathikulangara, J., Prabu, T., Remillard, R. A, Rogers, A. E. E., Roshi, A., Salah, J. E., Sault, R. J., Udaya-Shankar, N., Srivani, K. S., Stevens, J., Subrahmanyan, R., Waterson, M., Wayth, R. B., Webster, R. L., Whitney, A. R., Williams, A., Williams, C. L., and Wyithe, J. S. B.
- Subjects
Astrophysics - Instrumentation and Methods for Astrophysics ,Astrophysics - Solar and Stellar Astrophysics - Abstract
The Murchison Widefield Array is a low frequency (80 - 300 MHz) SKA Precursor, comprising 128 aperture array elements (known as tiles) distributed over an area of 3 km diameter. The MWA is located at the extraordinarily radio quiet Murchison Radioastronomy Observatory in the mid-west of Western Australia, the selected home for the Phase 1 and Phase 2 SKA low frequency arrays. The MWA science goals include: 1) detection of fluctuations in the brightness temperature of the diffuse redshifted 21 cm line of neutral hydrogen from the epoch of reionisation; 2) studies of Galactic and extragalactic processes based on deep, confusion-limited surveys of the full sky visible to the array; 3) time domain astrophysics through exploration of the variable radio sky; and 4) solar imaging and characterisation of the heliosphere and ionosphere via propagation effects on background radio source emission. This paper concentrates on the capabilities of the MWA for solar science and summarises some of the solar science results to date, in advance of the initial operation of the final instrument in 2013., Comment: 5 pages, 1 figure
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- 2013
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37. Acute heart failure and adverse events associated with the presence of renal dysfunction and hyperkalaemia. EAHFE- renal dysfunction and hyperkalaemia
- Author
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Gil, Cristina, Alonso, Héctor, Pérez-Llantada, Enrique, Llopis-García, Guillermo, Santos-Matallana, Maria Carmen, Barrenechea-Moxó, María Luisa Docavo, Salgado-Pérez, Lucía, Escoda, Rosa, Xipell, Carolina, Sánchez, Carolina, Gaytan, Josep María, Pérez-Durá, María José, Salvo, Eva, Pavón, José, Noval, Antonio, Torres, José Manuel, López-Grima, María Luisa, Valero, Amparo, Juan, María Ángeles, Aguirre, Alfons, Pedragosa, Maria Angels, Mínguez-Masó, Silvia, Alonso, María Isabel, Ruiz, Francisco, Franco, José Miguel, Mecina, Ana Belén, Tost, Josep, Berenguer, Marta, Donea, Ruxandra, Sánchez-Ramón, Susana, Carbajosa-Rodríguez, Virginia, Piñera, Pascual, Sánchez-Nicolás, José Andrés, Garate, Raquel Torres, Alquézar-Arbé, Aitor, Rizzi, Miguel Alberto, Herrera, Sergio, Roset, Alex, Cabello, Irene, Haro, Antonio, Richard, Fernando, Álvarez-Perez, José María, López-Diez, María Pilar, Vázquez-Álvarez, Joaquín, Prieto-García, Belén, García, María García, González, Marta Sánchez, Javaloyes, Patricia, Marquina, Víctor, Jiménez, Inmaculada, Hernández, Néstor, Brouzet, Benjamín, Espinosa, Begoña, Andueza, Juan Antonio, Romero, Rodolfo, Ruíz, Martín, Calvache, Roberto, Serralta, María Teresa Lorca, Jave, Luis Ernesto Calderón, Arriaga, Beatriz Amores, Bergua, Beatriz Sierra, Mojarro, Enrique Martín, Jiménez, Brigitte Silvana Alarcón, Bécquer, Lisette Travería, Burillo, Guillermo, García, Lluís Llauger, LaSalle, Gerard Corominas, Urbano, Carmen Agüera, Soto, Ana Belén García, Padial, Elisa Delgado, Ferrer, Ester Soy, Garrido, José Manuel, Lucas-Imbernón, Francisco Javier, Gaya, Rut, Bibiano, Carlos, Mir, María, Rodríguez, Beatriz, Carballo, José Luis, Rodríguez-Adrada, Esther, Miranda, Belén Rodríguez, Jacob, Javier, Llauger, Lluis, Herrero-Puente, Pablo, Martín-Sánchez, Francisco Javier, Llorens, Pere, Gil, Victor, Fuentes, Marta, and Miró, Òscar
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- 2019
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38. Magnetic field variations and the seismicity of solar active regions
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Martinez-Oliveros, J. C. and Donea, A. -C.
- Subjects
Astrophysics - Solar and Stellar Astrophysics - Abstract
Dynamical changes in the solar corona have proven to be very important in inducing seismic waves into the photosphere. Different mechanisms for their generation have been proposed. In this work, we explore the magnetic field forces as plausible mechanisms to generate sunquakes as proposed by Hudson, Fisher and Welsch. We present a spatial and temporal analysis of the line-of-sight magnetic field variations induced by the seismically active 2003 October 29 and 2005 January 15 solar flares and compare these results with other supporting observations., Comment: 4 pages, 4 figures, letter, Accepted in February by MNRAS
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- 2009
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39. Epidemiology and risk factors associated with Anaplasma marginale infection of cattle in Peninsular Malaysia
- Author
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Ola-Fadunsin, Shola David, Gimba, Fufa Ido, Abdullah, Donea Abdurazak, Sharma, Reuben Sunil Kumar, Abdullah, Faez Jesse Firdaus, and Sani, Rehana Abdullah
- Published
- 2018
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40. A NEW METHOD FOR SCREENING ELEMENTAL IMPURITIES IN MEDICO-PHARMACEUTICAL DISINFECTANTS.
- Author
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ALBOTA, Florin, SERBAN, Andreea, IONUZ, Erhan, VIRGOLICI, Marian, DONEA, Catalin, DOBRESCU, Ioana, and MOISE, Ioan-Valentin
- Subjects
PHYSICS laboratories ,CHEMICAL testing ,SURGICAL site ,DISINFECTION & disinfectants ,TESTING laboratories - Abstract
Healthcare associated infections consist a major concern in South-East European countries. As hospital activities try to eliminate the possible risks of infections, the quality of the disinfectants used in surgical sites, microbiological laboratories and other aseptic places must be ensured by using a proper product. In this context, the PEROKLIN product produced by Klintensiv Ldt., Romania, was tested using ICP-MS technique at the IFIN-HH Chemical and Physical Test Laboratory in terms of determining the elemental concentrations of several elements of interest. A dedicated chemical protocol was developed for that purpose and the method was validated according to international guidelines. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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41. Current recommendations in pediatric interventional gastrointestinal endoscopy
- Author
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Smaranda Diaconescu, Lorenza Donea, Andreea Nichita, Silvia Strat, Oana Maria Rosu, Nicoleta Gimiga, Claudia Olaru, Laura Bozomitu, Gheorghe Balan, and Gabriela Stefanescu
- Subjects
endoscopy ,interventional procedure ,child ,Medicine ,Pediatrics ,RJ1-570 - Abstract
Interventional digestive endoscopy in the pediatric population is major procedure in the diagnostic and therapeutic algorithm in children with different pathologies in the gastrointestinal spectrum and with a marked evolution in the current medical practice. This article attempts to describe all the situations where this technique is required electively or as a matter of urgency, providing a description of the method, the indications, as well as the complications that may arise. The interventional procedure is performed by a pediatric gastroenterologist or endoscopy technician, sometimes with the assistance of gastroenterologist for adults, under general anesthesia with orotracheal intubation or under conscious sedation. A good prognosis in such cases depends on the patient’s status, the available equipment, the expertise of the pediatric gastroenterologist, as well as on working together in the interdisciplinary team.
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- 2019
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42. Recomandări actuale în endoscopia digestivă intervenţională pediatrică
- Author
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Smaranda Diaconescu, Lorenza Donea, Andreea Nichita, Silvia Strat, Oana Maria Roşu, Nicoleta Gimiga, Claudia Olaru, Gabriela Ghiga, Bogdan Rotaru, Laura Bozomitu, Gheorghe Bălan, and Gabriela Ştefănescu
- Subjects
endoscopie ,procedură intervenţională ,copil ,Medicine ,Pediatrics ,RJ1-570 - Abstract
Endoscopia digestivă intervenţională în populaţia pediatrică este o etapă esenţială în algoritmul diagnostic şi terapeutic la copiii cu diferite patologii din sfera gastrointestinală, cu o marcată evoluţie în practica medicală curentă. Articolul de faţă descrie situaţiile în care tehnica este necesară în mod electiv sau în urgenţă, cu descrierea metodei, a indicaţiilor, dar şi a complicaţiilor care pot surveni. Procedura intervenţională se practică de către gastroenterologul sau endoscopistul pediatru, asistat uneori de gastroenterologul pentru adulţi, sub anestezie generală cu intubaţie orotraheală sau sedare conştientă. Un prognostic bun în aceste cazuri depinde de statusul pacientului, de aparatura disponibilă, de experienţa gastroenterologului pediatru, dar şi de colaborarea cu echipa interdisciplinară.
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- 2019
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43. RARE CAUSES OF ACUTE ESOPHAGITIS WITH SEVERE DYSPHAGIA IN CHILDREN
- Author
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Smaranda Diaconescu, Cristina-Gabriela Șchiopu, Nicoleta Gimiga, Stefana Maria Moisa, Gabriela Ghiga, Lorenza Donea, Gabriela Ștefănescu, and Oana-Maria Roșu
- Subjects
child ,dysphagia ,esophagitis ,Dentistry ,RK1-715 - Abstract
Esophagitis in pediatrics could have various causes, such as acid and non-acid gastroesophageal reflux, food allergies, infections, trauma, and iatrogenic causes. A three year old patient was admitted into the General Pediatrics department in our hospital for abdominal pain, vomiting, dysphagia, mild diarrhea, loss of appetite, fever (39°C) , with the onset of the symptomatology occurring 4-5 days prior to hospital admission. Clinical exam reveals dysphagia for liquids and solids and diffuse abdominal pain. Upper gastrointestinal endoscopy reveals an esophagus with multiple ulcerations and aphthoid-type lesions, as well as a friable mucosa that bleeds easily in contact with the endoscope. Candida albicans was found in feces. Considering the negative anamnesis for ingestion of corrosive substances, the case raises the suspicion of lesions associated with Candida albicans or of a viral etiology. The treatment with proton pump inhibitors, antimycotics, and preparations with antiviral and immunomodulatory actions determined a rapid favorable evolution. The inflammatory lesions of the esophagus can be varied, often having non-specific aspect. The endoscopic modifications of the mucosa are extremely typical in some cases. Careful differential diagnosis is mandatory, as in the long term all types of untreated esophagitis can become complicated by the development of esophageal stenoses.
- Published
- 2019
44. CHIST CONGENITAL DE COLEDOC LA UN SUGAR – CAZ CLINIC ŞI REVIEW DE LITERATURĂ
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Smaranda Diaconescu, Silvia Strat, Andreea Nichita, Gabriela Păduraru, Gabriela Ghiga, Oana Maria Roşu, Ana Maria Scurtu, Cristina Alexa, Petru Plămadeală, Eduard Vasile Roşu, and Lorenza Donea
- Subjects
chist coledocian ,icter ,colestază ,sugar ,Medicine ,Pediatrics ,RJ1-570 - Abstract
Chistul congenital de coledoc este mai frecvent diagnosticat la copiii până la 10 ani, afectând preponderent persoanele de sex feminin. Prezentăm un caz de chist coledocian la un sugar de sex masculin în vârstă de 7 luni, care a debutat brusc cu icter sclerotegumentar şi inapetenţă. Ecografia abdominală a evidenţiat o formaţiune transsonică, hiperreflectogenă, cu localizare pe topografia coledocului, căi biliare intrahepatice dilatate, iar examenele de laborator au decelat un sindrom sever de citoliză hepatică şi colestază. Diagnosticul a fost confirmat cu ajutorul IRM colangiopancreatic efectuat în urgenţă şi a impus intervenţia chirurgicală. Diagnosticul diferenţial al sindroamelor de colestază trebuie să excludă şi chistul coledocian, indiferent de vârsta pacientului, din cauza complicaţiilor şi riscului de malignizare.
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- 2019
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45. CONGENITAL CHOLEDOCHAL CYST IN A TODDLER – CASE REPORT AND LITERATURE REVIEW
- Author
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Smaranda Diaconescu, Silvia Strat, Andreea Nichita, Gabriela Paduraru, Gabriela Ghiga, Oana Maria Rosu, Ana Maria Scurtu, Cristina Alexa, Petru Plamadeala, Eduard Vasile Rosu, and Lorenza Donea
- Subjects
choledochal cyst ,jaundice ,cholestasis ,Medicine ,Pediatrics ,RJ1-570 - Abstract
Congenital choledochal cysts are more frequently diagnosed in children under the age of 10, occurring prevailingly in female patients. We are presenting a case of choledochal cyst in a 7-month-old male baby, which had a sudden onset with scleral-cutaneous jaundice and lack of appetite. Abdominal ultrasound revealed a transonic, hyperreflective formation located in the topography of the main bile duct, dilated intrahepatic bile ducts, and laboratory tests revealed a severe syndrome of hepatic cytolysis and cholestasis. The diagnosis was confirmed using cholangiopancreatic MRI performed in an emergency regime and required surgical intervention. Therefore, the differential diagnosis of cholestasis syndromes must rule out choledochal cyst irrespective of the patient’s age due to the complications and risk of malignization.
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- 2019
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46. Helioseismic analysis of the solar flare-induced sunquake of 2005 January 15. II: A magneto-seismic study
- Author
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Martinez-Oliveros, J. C., Donea, A. -C., Cally, P. S., and Moradi, H.
- Subjects
Astrophysics - Abstract
On 2005 January 15, the active region AR10720 produced an X1.2 solar flare that induced high levels of seismicity into the photospheric layers. The seismic source was detected using helioseismic holography and analysed in detail in Paper I. Egression power maps at 6 mHz with a 2 mHz bandwidth revealed a compact acoustic source strongly correlated with the footpoints of the coronal loop that hosted the flare. We present a magneto-seismic study of this active region in order to understand, for the first time, the magnetic topological structure of a coronal field that hosts an acoustically active solar flare. The accompanying analysis attempts to answer questions such as: Can the magnetic field act as a barrier and prevent seismic waves from spreading away from the focus of the sunquake? And, what is the most efficient magnetic structure that would facilitate the development of a strong seismic source in the photosphere?, Comment: 7 pages, 7 figures, accepted in MNRAS
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- 2008
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47. Seismic Emissions from a Highly Impulsive M6.7 Solar Flare
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Martinez-Oliveros, J. C., Moradi, H., and Donea, A-C.
- Subjects
Astrophysics - Abstract
On 10 March 2001 the active region NOAA 9368 produced an unusually impulsive solar flare in close proximity to the solar limb. This flare has previously been studied in great detail, with observations classifying it as a type 1 white-light flare with a very hard spectrum in hard X-rays. The flare was also associated with a type II radio burst and coronal mass ejection. The flare emission characteristics appeared to closely correspond with previous instances of seismic emission from acoustically active flares. Using standard local helioseismic methods, we identified the seismic signatures produced by the flare that, to date, is the least energetic (in soft X-rays) of the flares known to have generated a detectable acoustic transient. Holographic analysis of the flare shows a compact acoustic source strongly correlated with the impulsive hard X-ray, visible continuum, and radio emission. Time-distance diagrams of the seismic waves emanating from the flare region also show faint signatures, mainly in the eastern sector of the active region. The strong spatial coincidence between the seismic source and the impulsive visible continuum emission reinforces the theory that a substantial component of the seismic emission seen is a result of sudden heating of the low photosphere associated with the observed visible continuum emission. Furthermore, the low-altitude magnetic loop structure inferred from potential--field extrapolations in the flaring region suggests that there is a significant inverse correlation between the seismicity of a flare and the height of the magnetic loops that conduct the particle beams from the corona., Comment: 16 pages, 7 figures, Solar Physics Topical Issue: SOHO 19/GONG 2007 "Seismology of Magnetic Activity", Accepted
- Published
- 2008
- Full Text
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48. From GHz to mHz: A Multiwavelength Study of the Acoustically Active 14 August 2004 M7.4 Solar Flare
- Author
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Martinez-Oliveros, J. C., Moradi, H., Besliu-Ionescu, D., Donea, A. -C, Cally, P. S., and Lindsey, C.
- Subjects
Astrophysics - Abstract
We carried out an electromagnetic acoustic analysis of the solar flare of 14 August 2004 in active region AR10656 from the radio to the hard X-ray spectrum. The flare was a GOES soft X-ray class M7.4 and produced a detectable sun quake, confirming earlier inferences that relatively low-energy flares may be able to generate sun quakes. We introduce the hypothesis that the seismicity of the active region is closely related to the heights of coronal magnetic loops that conduct high-energy particles from the flare. In the case of relatively short magnetic loops, chromospheric evaporation populates the loop interior with ionized gas relatively rapidly, expediting the scattering of remaining trapped high-energy electrons into the magnetic loss cone and their rapid precipitation into the chromosphere. This increases both the intensity and suddenness of the chromospheric heating, satisfying the basic conditions for an acoustic emission that penetrates into the solar interior., Comment: Accepted in Solar Physics
- Published
- 2007
- Full Text
- View/download PDF
49. Helioseismic analysis of the solar flare-induced sunquake of 2005 January 15
- Author
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Moradi, H., Donea, A. -C., Lindsey, C., Besliu-Ionescu, D., and Cally, P. S.
- Subjects
Astrophysics - Abstract
We report the discovery of one of the most powerful sunquakes detected to date, produced by an X1.2-class solar flare in active region 10720 on 2005 January 15. We used helioseismic holography to image the source of seismic waves emitted into the solar interior from the site of the flare. Acoustic egression power maps at 3 and 6 mHz with a 2 mHz bandpass reveal a compact acoustic source strongly correlated with impulsive hard X-ray and visible-continuum emission along the penumbral neutral line separating the two major opposing umbrae in the $\delta$-configuration sunspot that predominates AR10720. The acoustic emission signatures were directly aligned with both hard X-ray and visible continuum emission that emanated during the flare. The visible continuum emission is estimated at $2.0 \times 10^{23}$ J, approximately 500 times the seismic emission of $\sim 4 \times 10^{20}$ J. The flare of 2005 January 15 exhibits the same close spatial alignment between the sources of the seismic emission and impulsive visible continuum emission as previous flares, reinforcing the hypothesis that the acoustic emission may be driven by heating of the low photosphere. However, it is a major exception in that there was no signature to indicate the inclusion of protons in the particle beams thought to supply the energy radiated by the flare. The continued strong coincidence between the sources of seismic emission and impulsive visible continuum emission in the case of a proton-deficient white-light flare lends substantial support to the ``back -- warming'' hypothesis, that the low photosphere is significantly heated by intense Balmer and Paschen continuum-edge radiation from the overlying chromosphere in white-light flares., Comment: 12 pages, 7 figures, published in MNRAS
- Published
- 2007
- Full Text
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50. M87 as a misaligned Synchrotron-Proton Blazar
- Author
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Reimer, A., Protheroe, R. J., and Donea, A. -C.
- Subjects
Astrophysics - Abstract
The giant radio galaxy M87 is usually classified as a Fanaroff-Riley class I source, suggesting that M87 is a mis-aligned BL Lac object. Its unresolved nuclear region emits strong non-thermal emission from radio to X-rays which has been interpreted as synchrotron radiation. In an earlier paper we predicted M87 as a source of detectable gamma ray emission in the context of the hadronic Synchrotron-Proton Blazar (SPB) model. The subsequent tentative detection of TeV energy photons by the HEGRA-telescope array would, if confirmed, make it the first radio galaxy to be detected at TeV-energies. We discuss the emission from the unresolved nuclear region of M87 in the context of the SPB model, and give examples of possible model representations of its non-simultaneous spectral energy distribution. The low-energy component can be explained as synchrotron radiation by a primary relativistic electron population that is injected together with energetic protons into a highly magnetized emission region. We find that the gamma-ray power output is dominated either by mu/pi-synchrotron or proton synchrotron radiation depending on whether the primary electron synchrotron component peaks at low or high energies, respectively. The predicted gamma-ray luminosity peaks at around 100 GeV at a level comparable to that of the low-energy hump, and this makes M87 a promising candidate source for the newly-commissioned high-sensitivity low-threshold Cherenkov telescopes H.E.S.S., VERITAS, MAGIC and CANGAROO III. (abridged), Comment: 12 pages, 4 figures, accepted for publication in A&A
- Published
- 2004
- Full Text
- View/download PDF
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