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Your search keyword '"Yatini, Clara Y."' showing total 9 results
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9 results on '"Yatini, Clara Y."'

1. Low-Latitude Fluctuation of Ionospheric Magnetic Field Measured by LAPAN-A3 Satellite

Author

Nuraeni, Fitri, Musafar Kilowasid, La Ode M., Yatini, Clara Y., Wellyanita, Visca, Utama, Satriya, Andrian, Yoga, Zubaidah, Teti, Hasbi, Wahyudi, Andi Aris, B. Moh., Pranoto, Setyanto C., Bangkit, Harry, Muzirwan, Anggari, Ega A., Erlansyah, Miharja, Nata, Ratnasari, Dwi, Ayuningtyas, Prita, Putra, Angga Yolanda, Basit, Abdul, editor, Yulihastin, Erma, editor, Cahyarini, Sri Yudawati, editor, Santoso, Heru, editor, Pranowo, Widodo S., editor, Slamet S., Lilik, editor, and Belgaman, Halda Aditya, editor

Published
2023
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4. Cosmic radiation observations in civil aircraft flights.

Author

Admiranto, A. Gunawan, Yatini, Clara Y., Muhamad, Johan, Maryam, Siti, Elyyani, Sofyan, Hasnel, Prasetyo, Heru, Kusdiana, and Noor, Ferdiansyah

Subjects
*COSMIC rays, *SEA level, *NEUTRONS, *RADIATION doses, *DOSIMETERS
Abstract

We analyzed dose rate data of space neutron and gamma radiation during several flight with various destinations, i.e. Jakarta – Kupang, Kupang – Jakarta, Jakarta – Pontianak, and Pontianak – Jakarta. Data were collected using personal radiation dosimeter (RadEye for neutron and Dosicard for gamma radiation) during flights from take off until landing at the destination airports. As expected, the higher the aircraft from sea level, the radiation received are higher also, but the behaviour of the neutron and gamma radiation are different. The neutron radiation received are more erratic compared with that of the gamma radiation. We found the correlation between the height of the aircraft and neutron and gamma radiation dose rates with correlation coeficient values of 0.89, 0.86, 0.90, 0.87 respectively for neutron radiation and 0.91, 0.95, 0.84, 0.88 respectively for gamma radiation. We found the empirical relations between latitude and dose rates of neutron and gamma radiation in the height of 35.000 feet from the sea level as Dn = −0.034 Lat + 1.036 for neutron dose rates and Dg = −0.027 Lat + 0.636 for gamma radiation dose rates. [ABSTRACT FROM AUTHOR]

Published
2023
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6. Equatorial and low-latitude ionospheric response to the 17-18 March 2015 great storm over Southeast Asia longitude sector

Author

Jiang, Chunhua, primary, Yang, Guobin, additional, Liu, Jing, additional, Yokoyama, Tatsuhiro, additional, Liu, Tongxin, additional, Lan, Ting, additional, Zhou, Chen, additional, Zhang, Yuannong, additional, Zhao, Zhengyu, additional, Komolmis, Tharadol, additional, Supnithi, Pornchai, additional, and Yatini, Clara Y., additional

Published
2017
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7. Latitudinal variation of the specific local time of postmidnight enhancement peaks in F layer electron density at low latitudes: A case study

Author

Jiang, Chunhua, primary, Deng, Chi, additional, Yang, Guobin, additional, Liu, Jing, additional, Zhu, Peng, additional, Yokoyama, Tatsuhiro, additional, Song, Huan, additional, Lan, Ting, additional, Zhou, Chen, additional, Wu, Xiongbin, additional, Zhang, Yuannong, additional, Zhao, Zhengyu, additional, Komolmis, Tharadol, additional, Supnithi, Pornchai, additional, and Yatini, Clara Y., additional

Published
2016
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8. DEVELOPMENT OF HF MODELLING IN PENINSULAR MALAYSIA DURING THE RISE OF SOLAR CYCLE 24.

Author

Malik, Rafidah Abd, Abdullah, Mardina, Abdullah, Sabirin, Yokoyama Tatsuhiro, and Yatini, Clara Y.

Subjects
SOLAR cycle, SPACE environment, METEOROLOGICAL services
Abstract

The modelling of maximum useable frequency (MUF) is important in high frequency (HF) radio frequency management. Thus, the aim of this study was to develop MUF models and verify the models obtained with experimental data. The development of the models were carried out in Peninsular Malaysia during the rise of Solar Cycle 24 (2009 to 2011). The modelling parameters were the ionospheric F2-layer parameters obtained from the frequency modulated-continuous wave (FM-CW) ionosonde at Kototabang, Indonesia (0.2 °S, 100. 3°E; 10.36 °S magnetic latitude), and sunspot number (SSN) data obtained from Space Weather Services, Bureau of Meteorology, Australia. The experimental MUF data was obtained from STRIDE, Ministry of Defence, Malaysia. The regression method was used to derive the mathematical models. MUFTime and MUFSSN were derived from the regression method. Observation from the comparison of plots between MUFTime and MUFSSN with MUF experimental revealed that the magnitudes for MUFTime and MUFSSN with MUF experimental were of similar trend. The mean absolute error (MAE) between MUFTime and MUFSSN with MUF experimental were 0.77 and 0.86 respectively. In order to obtain HF operating frequencies, both models would need to be combined to implement MUF prediction. [ABSTRACT FROM AUTHOR]

Published
2019

9. Latitudinal variation of the specific local time of postmidnight enhancement peaks in Flayer electron density at low latitudes: A case study

Author

Jiang, Chunhua, Deng, Chi, Yang, Guobin, Liu, Jing, Zhu, Peng, Yokoyama, Tatsuhiro, Song, Huan, Lan, Ting, Zhou, Chen, Wu, Xiongbin, Zhang, Yuannong, Zhao, Zhengyu, Komolmis, Tharadol, Supnithi, Pornchai, and Yatini, Clara Y.

Abstract

Ionospheric nighttime enhancements are manifested in an increase of the electron density at nighttime. This paper studies the latitudinal variation of the specific local time of postmidnight enhancement peaks using ionosondes distributed at low latitudes. To obtain the parameters of the ionosphere, we manually extracted ionograms recorded by ionosondes. Cases show that there are significant latitudinal variations in the observed local time of the postmidnight enhancement peaks. Results show that the lower the geomagnetic latitude, the earlier the enhancement peak occurred in the geomagnetic northern hemisphere. Additionally, the enhancement peaks occurred earlier in the geomagnetic southern hemisphere than that in the geomagnetic northern hemisphere for these present cases. We suggest that the combined effect of the geomagnetic inclination and transequatorial meridional wind might be the main driving force for latitudinal variation of the local time of the occurrence. Nighttime enhancement is investigated using multi‐ionosondesThere are significant latitudinal variations in the local time of the peaksThe meridional wind and geomagnetic inclination are important for the local times

Published
2016
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