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1. ASTROPHYSICAL STUDIES WITH SMALL LOW-FREQUENCY RADIO TELESCOPES OF NEW GENERATION

Author

A. A. Konovalenko, S. M. Yerin, I. M. Bubnov, P. L. Tokarsky, V. V. Zakharenko, O. M. Ulyanov, M. A. Sidorchuk, S. V. Stepkin, A. O. Gridin, G. V. Kvasov, V. L. Koliadin, V. M. Melnik, V. V. Dorovskyy, M. M. Kalinichenko, G. V. Litvinenko, P. Zarka, L. Denis, J. Girard, H. O. Rucker, M. Panchenko, A. A. Stanislavsky, O. D. Khristenko, D. V. Mukha, O. M. Reznichenko, V. M. Lisachenko, V. V. Bortsov, A. I. Brazhenko, I. Y. Vasylieva, A. O. Skoryk, A. I. Shevtsova, and K. Y. Mylostna

Subjects
astrophysics, decameter and meter radio waves, smallsized radio telescope, Astronomy, QB1-991
Abstract

Purpose: define and theoretically substantiate the range of astrophysical problems that may be efficiently solved using small antenna arrays. Design/methodology/approach: Observation parameters and configurations of a set of small antenna arrays included in the future Giant Ukrainian radio telescope, have been derived based on the theoretical analysis and scientific results obtained by UTR-2 and URAN radio telescopes. Results: We have proved that a wide scope of problems can be efficiently solved by small low-frequency antenna arrays, ranging from Solar studies to the search for cosmological effects associated with neutral hydrogen spectral line in the early Universe at high red shifts. For each study program, we have calculated the desired observation parameters (integration time, time and frequency resolutions), indicated the required antenna configurations and operating modes (interferometric or additive). Conclusions: We have shown that at the construction stage of the Giant Ukrainian radio telescope and gradual commissioning of its new sections, we can solve a number of important astrophysical problems. As the new sections are being added, the observation techniques and data processing methods will constantly be improving.

Published
2016
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2. Astrophysical Studies with Small Low-Frequency Radio Telescopes of New Generation

Author

D. V. Mukha, Serge Yerin, A. A. Konovalenko, M. M. Kalinichenko, O. M. Ulyanov, Peter L. Tokarsky, V. Bortsov, S. V. Stepkin, V. L. Koliadin, O. M. Reznichenko, Mykhaylo Panchenko, I. Y. Vasylieva, G. Kvasov, V. Lisachenko, A. I. Brazhenko, A. O. Skoryk, V. M. Melnik, A. O. Gridin, Loïc Denis, A. I. Shevtsova, I. M. Bubnov, K. Mylostna, Julien N. Girard, O. D. Khristenko, Aleksander Stanislavsky, M. A. Sidorchuk, H. O. Rucker, V. V. Dorovskyy, V. V. Zakharenko, P. Zarka, G. Litvinenko, Institute of Radio Astronomy of NASU [Kharkiv] (IRA), National Academy of Sciences of Ukraine (NASU), Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Unité Scientifique de la Station de Nançay (USN), Centre National de la Recherche Scientifique (CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers en région Centre (OSUC), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO), Space Research Institute of Austrian Academy of Sciences (IWF), Austrian Academy of Sciences (OeAW), Main Astronomical Observatory of NAS of Ukraine (MAO), Observatoire des Sciences de l'Univers en région Centre (OSUC), and Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, decameter and meter radio waves, 010504 meteorology & atmospheric sciences, Physics and Astronomy (miscellaneous), astrophysics, smallsized radio telescope, [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph], lcsh:Astronomy, Astrophysics::Instrumentation and Methods for Astrophysics, Astronomy, Astronomy and Astrophysics, Astrophysics, Low frequency, 01 natural sciences, Radio telescope, lcsh:QB1-991, Space and Planetary Science, [SDU]Sciences of the Universe [physics], 0103 physical sciences, Very-long-baseline interferometry, Electrical and Electronic Engineering, 010303 astronomy & astrophysics, ComputingMilieux_MISCELLANEOUS, 0105 earth and related environmental sciences
Abstract

Purpose: define and theoretically substantiate the range of astrophysical problems that may be efficiently solved using small antenna arrays. Design/methodology/approach: Observation parameters and configurations of a set of small antenna arrays included in the future Giant Ukrainian radio telescope, have been derived based on the theoretical analysis and scientific results obtained by UTR-2 and URAN radio telescopes. Results: We have proved that a wide scope of problems can be efficiently solved by small low-frequency antenna arrays, ranging from Solar studies to the search for cosmological effects associated with neutral hydrogen spectral line in the early Universe at high red shifts. For each study program, we have calculated the desired observation parameters (integration time, time and frequency resolutions), indicated the required antenna configurations and operating modes (interferometric or additive). Conclusions: We have shown that at the construction stage of the Giant Ukrainian radio telescope and gradual commissioning of its new sections, we can solve a number of important astrophysical problems. As the new sections are being added, the observation techniques and data processing methods will constantly be improving.

Published
2016

3. The modern radio astronomy network in Ukraine: UTR-2, URAN and GURT

Author

I. Y. Vasylieva, Valentin Melnik, A. P. Reznik, V. Bovkun, E. R. Rudavin, Julien N. Girard, Helmut O. Rucker, O. Lytvinenko, A. Kravtsov, A. Lozinsky, K. Mylostna, Dmytro M. Vavriv, A. A. Gridin, Jean-Mathias Grieβmeier, N. V. Shevchuk, A. I. Shevtsova, V. V. Vinogradov, V. V. Dorovskyy, Aleksander Stanislavsky, Valery V. Shevchenko, A. Reznichenko, G. Kvasov, A. Kuzin, Peter L. Tokarsky, Y. Volvach, I. P. Kravtsov, S. N. Yerin, M. A. Sidorchuk, A. D. Khristenko, I. N. Bubnov, D. V. Mukha, Michel Tagger, Vladimir B. Ryabov, M. R. Olyak, M. S. Plakhov, V. V. Zakharenko, Georg Fischer, A. Shevchenko, Carine Briand, A. Coffre, A. O. Skoryk, V. Bortsov, S. V. Stepkin, A. Antonov, O. Pylaev, V. A. Shepelev, A. P. Miroshnichenko, R. V. Vashchishin, Alain Lecacheux, O. Ivantyshin, Loïc Denis, V. F. Kulishenko, A. I. Brazhenko, O. M. Ulyanov, V. Lisachenko, P. Zarka, A. A. Konovalenko, A. S. Belov, E. Bulakh, L. G. Sodin, Mykhaylo Panchenko, Didier Charrier, A. Vasilyev, N. Vasilenko, N. N. Kalinichenko, V. Koshovyy, V. L. Koliadin, R. Kozhin, I. Zhouk, A. A. Koval, G. Mann, G. Litvinenko, Institute of Radio Astronomy of NASU [Kharkiv] (IRA), National Academy of Sciences of Ukraine (NASU), Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Future University-Hakodate, Max Planck Institute of Molecular Cell Biology and Genetics (MPI-CBG), Max-Planck-Gesellschaft, Laboratoire de Biologie et de Pharmacologie Appliquée (LBPA), École normale supérieure - Cachan (ENS Cachan)-Centre National de la Recherche Scientifique (CNRS), Centre de Recherches Linguistiques sur l'Asie Orientale (CRLAO), École des hautes études en sciences sociales (EHESS)-Institut National des Langues et Civilisations Orientales (Inalco)-Centre National de la Recherche Scientifique (CNRS), Physical and Computing Mechanics Department, Physical and Computing Mechanics Department (TSU), Tomsk State University [Tomsk]-Tomsk State University [Tomsk], Main Astronomical Observatory of NAS of Ukraine (MAO), Space Research Institute of Austrian Academy of Sciences (IWF), Austrian Academy of Sciences (OeAW), Ingénierie des Matériaux Polymères (IMP), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université Jean Monnet [Saint-Étienne] (UJM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Hubert Curien [Saint Etienne] (LHC), Institut d'Optique Graduate School (IOGS)-Université Jean Monnet [Saint-Étienne] (UJM)-Centre National de la Recherche Scientifique (CNRS), Unité Scientifique de la Station de Nançay (USN), Université d'Orléans (UO)-Observatoire des Sciences de l'Univers en région Centre (OSUC), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique et Chimie de l'Environnement et de l'Espace (LPC2E), Observatoire des Sciences de l'Univers en région Centre (OSUC), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Centre National d’Études Spatiales [Paris] (CNES), Laboratoire SUBATECH Nantes (SUBATECH), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Nantes (UN)-Mines Nantes (Mines Nantes), University of Leeds, Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA (UMR_8109)), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS), Astrophysique Interprétation Modélisation (AIM (UMR7158 / UMR_E_9005 / UM_112)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), and Mines Nantes (Mines Nantes)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, 010504 meteorology & atmospheric sciences, Bandwidth (signal processing), Antenna aperture, Radio telescope, Astronomy, Astronomy and Astrophysics, LOFAR, 01 natural sciences, 7. Clean energy, Antenna array, Space and Planetary Science, [SDU]Sciences of the Universe [physics], Space research, 0103 physical sciences, Very-long-baseline interferometry, Antenna arrays, Radio astronomy, Decametre, 010303 astronomy & astrophysics, 0105 earth and related environmental sciences, Remote sensing
Abstract

International audience; The current status of the large decameter radio telescope UTR-2 (Ukrainian T-shaped Radio telescope) together with its VLBI system called URAN is described in detail. By modernization of these instruments through implementation of novel versatile analog and digital devices as well as new observation techniques, the observational capabilities of UTR-2 have been substantially enhanced. The total effective area of UTR-2 and URAN arrays reaches 200 000 m2, with 24 MHz observational bandwidth (within the 8-32 MHz frequency range), spectral and temporal resolutions down to 4 kHz and 0.5 msec in dynamic spectrum mode or virtually unlimited in waveform mode. Depending on the spectral and temporal resolutions and confusion effects, the sensitivity of UTR-2 varies from a few Jy to a few mJy, and the angular resolution ranges from ~ 30 arcminutes (with a single antenna array) to a few arcseconds (in VLBI mode). In the framework of national and international research projects conducted in recent years, many new results on Solar system objects, the Galaxy and Metagalaxy have been obtained. In order to extend the observation frequency range to 8-80 MHz and enlarge the dimensions of the UTR-2 array, a new instrument - GURT (Giant Ukrainian Radio Telescope) - is now under construction. The radio telescope systems described herein can be used in synergy with other existing low-frequency arrays such as LOFAR, LWA, NenuFAR, as well as provide ground-based support for space-based instruments.

Published
2016

4. Multi-antenna observations in the low-frequency radio astronomy of solar system objects and related topics studies

Author

A. V. Frantsuzenko, Vladimir B. Ryabov, O. Ivantyshin, Masafumi Imai, Peter L. Tokarsky, G. Mann, V. V. Koshovy, G. Litvinenko, I. N. Bubnov, Georg Fischer, V. V. Dorovskyy, Loïc Denis, V. V. Zakharenko, S. V. Stepkin, Helmut O. Rucker, R. V. Vashchishin, A. A. Stanislavsky, I. Y. Vasylieva, P. Zarka, Valentin Melnik, O. A. Litvinenko, Alexandr A. Konovalenko, A. Lecacheux, O. M. Ulyanov, V. A. Shepelev, A. Reznichenko, A. I. Shevtsova, S. N. Yerin, N. N. Kalinichenko, E. Vasylkovsky, A. Brazhenko, N. V. Shevchuk, A. A. Koval, Mykhaylo Panchenko, V. L. Koliadin, A. O. Skoryk, A. Lozinsky, Jean-Mathias Griessmeier, M. A. Sidorchuk, Y. Volvach, K. Mylostna, Institute of Radio Astronomy of NASU [Kharkiv] (IRA), National Academy of Sciences of Ukraine (NASU), Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Commission for Astronomy of the Austrian Academy of Sciences, Austrian Academy of Sciences (OeAW), Future University-Hakodate, Département de Mathématiques [Evry], Université d'Évry-Val-d'Essonne (UEVE), Unité Scientifique de la Station de Nançay (USN), Centre National de la Recherche Scientifique (CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers en région Centre (OSUC), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO), Space Research Institute of Austrian Academy of Sciences (IWF), Laboratoire de Physique et Chimie de l'Environnement et de l'Espace (LPC2E), Observatoire des Sciences de l'Univers en région Centre (OSUC), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Centre National d’Études Spatiales [Paris] (CNES), Karpenko Physico-Mechanical [ Lviv], and Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)

Subjects
instrumentation, [PHYS]Physics [physics], Solar System, Computer science, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics::Instrumentation and Methods for Astrophysics, Astronomy, Radio emissions, Astrophysics::Cosmology and Extragalactic Astrophysics, LOFAR, radio astronomy, 7. Clean energy, Exoplanet, Electromagnetic interference, Space exploration, Jupiter, Radio telescope, Physics::Space Physics, ground-based observations, Astrophysics::Earth and Planetary Astrophysics, low frequency, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Radio astronomy
Abstract

International audience; Rapid progress currently takes place in the field of low-frequency radio astronomy in the meter-decameter-hectometer range of wavelengths. It is caused by a radical modernization of the existing radio telescopes, creation of a new generation of instruments, space-borne observations, and by the development of research on all classes of astrophysical objects, including the Solar System. On the other hand, a range of difficulties specific to low-frequency radio astronomy is known, which are caused by technical, methodological, and physical limitations. An effective strategy for overcoming these difficulties is based on synchronous observations using several radio telescopes separated by distances from a few to several thousand kilometers. This provides an opportunity to reduce and identify radio interference and the influence of the propagation media, to increase the sensitivity and resolution, and to solve many problems with higher efficiency. In recent years such simultaneous observations were carried out for the Sun, Jupiter, Saturn, interplanetary medium, pulsars, exoplanets, and transients using the radio telescopes UTR-2, URAN, GURT, NDA, NenuFAR, LOFAR and other. Parallel observations with the space missions WIND, STEREO, Cassini and Juno also facilitate improvement of the quality and reliability of low-frequency radio astronomical experiments.

Published
2016

5. Digital Receivers for Low-Frequency Radio Telescopes UTR-2, URAN, GURT

Author

R. V. Vashchishin, K. Mylostna, V. Bortsov, V. Lisachenko, O. Ivantyshyn, S. V. Stepkin, G. Litvinenko, Vladimir B. Ryabov, V. V. Dorovskyy, A. Kravtsov, D. V. Mukha, I. Y. Vasylieva, A. Coffre, Valentin Melnik, Y. Vasylkivskyi, O. M. Ulyanov, M. S. Plakhov, A. Lecacheux, Y. Volvach, Jean-Mathias Grießmeier, I. P. Kravtsov, Georg Fischer, V. V. Vinogradov, Aleksander Stanislavsky, A. Kuzin, V. L. Koliadin, A. Brazhenko, R. Kozhin, A. Reznichenko, S. N. Yerin, N. V. Shevchuk, A. Lozinsky, Dmytro M. Vavriv, A. A. Konovalenko, A. A. Koval, M. A. Sidorchuk, A. O. Skoryk, Loïc Denis, Helmut O. Rucker, Mykhaylo Panchenko, A. Vasilyev, E. Bulakh, N. Vasilenko, N. N. Kalinichenko, V. Koshovyy, V. A. Shepelev, A. I. Shevtsova, Philippe Zarka, I. N. Bubnov, G. Kvasov, V. V. Zakharenko, O. Pylaev, Institute of Radio Astronomy of NASU [Kharkiv] (IRA), National Academy of Sciences of Ukraine (NASU), Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA (UMR_8109)), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Unité Scientifique de la Station de Nançay (USN), Centre National de la Recherche Scientifique (CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers en région Centre (OSUC), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO), Forest Vegetation Ecology, Department of Forest Ecology and Management, Swedish University of Agricultural Sciences (SLU)-Swedish University of Agricultural Sciences (SLU), Future University-Hakodate, Main Astronomical Observatory of NAS of Ukraine (MAO), Space Research Institute of Austrian Academy of Sciences (IWF), Austrian Academy of Sciences (OeAW), Laboratoire de Physique et Chimie de l'Environnement et de l'Espace (LPC2E), Observatoire des Sciences de l'Univers en région Centre (OSUC), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Centre National d’Études Spatiales [Paris] (CNES), PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Université d'Orléans (UO)-Observatoire des Sciences de l'Univers en région Centre (OSUC), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, PSL Research University (PSL)-Centre National de la Recherche Scientifique (CNRS), Department of Forest Vegetation Ecology, Swedish University of Agricultural Sciences (SLU), and PSL Research University (PSL)-PSL Research University (PSL)-Centre National d’Études Spatiales [Paris] (CNES)

Subjects
Astronomical Objects, 010504 meteorology & atmospheric sciences, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Instrumentation: spectrographs, Astrophysics::Cosmology and Extragalactic Astrophysics, Data loss, Low frequency, Interference (wave propagation), 01 natural sciences, Radio telescope, 0103 physical sciences, Very-long-baseline interferometry, Instrumentation and Methods for Astrophysics (astro-ph.IM), 010303 astronomy & astrophysics, Instrumentation, 0105 earth and related environmental sciences, Remote sensing, Physics, [PHYS]Physics [physics], Astrophysics::Instrumentation and Methods for Astrophysics, Astronomy, Astronomy and Astrophysics, Digital radio, methods: data analysis, Astrophysics - Instrumentation and Methods for Astrophysics, Decametre, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract

This paper describes digital radio astronomical receivers used for decameter and meter wavelength observations. This paper describes digital radio astronomical receivers used for decameter and meter wavelength observations. Since 1998, digital receivers performing on-the-fly dynamic spectrum calculations or waveform data recording without data loss have been used at the UTR-2 radio telescope, the URAN VLBI system, and the GURT new generation radio telescope. Here we detail these receivers developed for operation in the strong interference environment that prevails in the decameter wavelength range. Data collected with these receivers allowed us to discover numerous radio astronomical objects and phenomena at low frequencies, a summary of which is also presented., 24 pages, 15 figures

Published
2016

6. USING PHASE DYNAMIC CROSS-SPECTRA FOR WIDEBAND RADIO ASTRONOMY OBSERVATIONS: EXPERIENCE FROM THE UTR-2 RADIO TELESCOPE

Author

V. L. Koliadin

Subjects
Parabolic antenna, Physics, business.industry, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics::Cosmology and Extragalactic Astrophysics, General Medicine, General Chemistry, Radio telescope, Optics, Side lobe, Very-long-baseline interferometry, Very low frequency, Antenna (radio), business, Radio astronomy, Radio wave
Abstract

Dynamic spectra characterize the distribution of the total power of the received signal over time and frequency. They are widely used in radio astronomy in analysis of observations. The paper describes a method that expands capabilities of such a time-frequency analysis via utilization of the phase difference between signals from two subantennas which are formed within the entire radio telescope antenna system. Phase dynamic spectra – the phase of the cross-spectrum of two signals as function of time and frequency – are formed by interferometric processing. Then, they are used for analysis together with the traditional dynamic spectra of power. This technique was implemented at the UTR-2 radio telescope. It has been used there for several years for visual detection of radio emission, for recognition of the interfering signals arriving from the antenna side lobes, as well as for differentiation of radio bursts observed within the main beam. If two pairs of antennas with noncollinear baselines are available, then the direction of arrival can be measured at each point of the time–frequency domain from the two phase dymamic spectra. The efficiency of this technique is illustrated by its application to qualitatively different types of sporadic radio emisson – namely, the emission of the Sun, Saturn, and flare stars.

Published
2012

7. State-of-the-art of low frequency radio astronomy, relevant antenna systems and international cooperation in Ukraine

Author

V. F. Kulishenko, G. Litvinenko, Julien N. Girard, G. Kvasov, Vladimir B. Ryabov, Mykhaylo Panchenko, V. L. Koliadin, Peter L. Tokarsky, I. Y. Vasylieva, S. V. Stepkin, Valentin Melnik, A. Coffre, A. A. Gridin, P. Zarka, A. Reznichenko, J.-M. Griebmeier, O. M. Ulyanov, S. N. Yerin, M. A. Sidorchuk, A. I. Brazhenko, Georg Fischer, M. Tagger, A. A. Konovalenko, V. A. Shepelev, A. D. Khristenko, I. N. Bubnov, V. V. Zakharenko, G. Mann, A. A. Koval, Loïc Denis, A. A. Stanislavsky, A. P. Reznik, Helmut O. Rucker, V. V. Dorovskyy, Didier Charrier, N. N. Kalinichenko, V. Koshovyy, Institute of Radio Astronomy of NASU [Kharkiv] (IRA), National Academy of Sciences of Ukraine (NASU), Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Space Research Institute of Austrian Academy of Sciences (IWF), Austrian Academy of Sciences (OeAW), Unité Scientifique de la Station de Nançay (USN), Centre National de la Recherche Scientifique (CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers en région Centre (OSUC), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO), Laboratoire de Physique et Chimie de l'Environnement et de l'Espace (LPC2E), Observatoire des Sciences de l'Univers en région Centre (OSUC), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Centre National d’Études Spatiales [Paris] (CNES), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Laboratoire SUBATECH Nantes (SUBATECH), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Nantes (UN)-Mines Nantes (Mines Nantes), Future University-Hakodate, Leibniz-Institut für Astrophysik Potsdam (AIP), Main Astronomical Observatory of NAS of Ukraine (MAO), Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS), and Mines Nantes (Mines Nantes)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, 010504 meteorology & atmospheric sciences, business.industry, Ukrainian, radio interferometry, phased arrays, LOFAR, Low frequency, 01 natural sciences, 7. Clean energy, language.human_language, Radio telescope, radio telescope, Radio propagation beacon, 0103 physical sciences, Very-long-baseline interferometry, language, Antenna (radio), Radio astronomy, Telecommunications, business, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], 010303 astronomy & astrophysics, 0105 earth and related environmental sciences
Abstract

International audience; The low frequency radio astronomy (decameter-meter range, frequencies of 10-300 MHz) currently demonstrates rapid progress all over the world. New generations of large antennas-LOFAR, LWA, MWA and others – have been created in many countries. At the same time Ukrainian radio astronomical systems UTR-2 and URAN still remain the largest and most informative ones at the lowest frequency range available for the ground-based radio astronomy (below 33 MHz), especially after their radical modernization during the most recent years. A great number of top priority results have been obtained on the basis of these radio telescopes. The results prove a high significance of the low frequency radio astronomy for astrophysics. Substantial part of these results have been obtained in the course of many year cooperation between Ukraine on one side and France, Austria, Germany and other countries on the other. Creation of new low frequency instruments GURT (Ukraine) and LSS/NenuFAR (France) for the wide frequency range of 10-80 MHz opens up new possibilities for research and fruitful cooperation.

Published
2015

8. Critical analysis of the current views on the nature of AIDS

Author

V L, Koliadin

Subjects
CD4-Positive T-Lymphocytes, Male, Acquired Immunodeficiency Syndrome, Sexual Behavior, AIDS Serodiagnosis, HIV, Plant Science, General Medicine, Antiviral Agents, Models, Biological, United States, Disease Outbreaks, Cytopathogenic Effect, Viral, Insect Science, Genetics, Humans, Female, Animal Science and Zoology
Published
1995

9. New Antennas and Methods for the Low Frequency Stellar and Planetary Radio Astronomy

Author

Alexandr A. Konovalenko, N. N. Kalinichenko, V. S. Nikolajenko, I. S. Falkovich, B. Thide, G. Litvinenko, A. P. Reznik, A. Lecacheux, V. L. Koliadin, M. A. Sidorchuk, H. O. Rucker, A. A. Stanislavsky, A. A. Gridin, I. N. Bubnov, V. V. Zakharenko, P. Zarka, Valentin Melnik, R. Karlsson, S. V. Stepkin, and D. V. Muhka

Subjects
Physics, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics::Instrumentation and Methods for Astrophysics, Astronomy, Astrophysics, LOFAR, Exoplanet, Jupiter, Radio telescope, Pulsar, Observatory, Physics::Space Physics, Astrophysics::Solar and Stellar Astrophysics, Astrophysics::Earth and Planetary Astrophysics, Ionosphere, Radio astronomy
Abstract

According to the special Program of the National Academy of Sciences of Ukraine, creation of the new giant Ukrainian radio telescope (GURT) was started a few years ago on the UTR-2 radio telescope observatory. The main goal is to reach maximum band at the lowest frequencies (10-70 MHz), effective area (step-by-step up to 100,000 sq.m), and high interference immunity for resolving many astrophysical tasks when the sensitivity is less limited by the confusion effects. These tasks include stellar radio astronomy (the Sun, solar wind, flare stars, pulsars, transients) and planetary one (Jupiter, planetary lightnings, Earth ionosphere, the Moon, exoplanets). This array should be complementary to the LOFAR, E-LOFAR systems. The first stages of the GURT (6 x 25 cross-dipole active elements) and broad-band digital registration of the impulsive and sporadic events were tested in comparison with the existing largest decameter array UTR-2.

Published
2011

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