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Your search keyword '"Konovalenko, Alexandr A."' showing total 23 results
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23 results on '"Konovalenko, Alexandr A."'

1. First observation of the solar Type III burst decay and its interpretation

Author

Melnik, Valentin N., Konovalenko, Alexandr A., Yerin, Sergey M., Bubnov, Igor M., Brazhenko, Anatoliy I., Frantsuzenko, Anatoliy V., Dorovskyy, Vladimir V., Shevchuk, Mykola V., and Rucker, Helmut O.

Subjects
Astrophysics - Solar and Stellar Astrophysics
Abstract

A decay of Type III burst into two Type III bursts was registered during solar observations by GURT and URAN-2 radio telescopes on April 18, 2017. Such phenomenon was observed for the first time. Newborn Type III bursts have drift rates smaller than that of decaying Type III burst. Such decays of Type III bursts were predicted by a gas-dynamic theory of high-energy electron beams propagating through the thermal background plasma. In the frame of this theory Type III sources are beam-plasma structures moving with constant velocities. In our case the sum of velocities of newborn Type III sources equals the velocity of decaying Type III source. The last one is 0.33c in the case of fundamental radio emission and 0.2c at the harmonic radio emission of Type III burst. The density ratio of slow and fast newborn Type III sources is about 3., Comment: 11 pages, 5 figures

Published
2019
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2. Beaming structures of Jupiter's decametric common S-bursts observed from LWA1, NDA, and URAN2 radio telescopes

Author

Imai, Masafumi, Lecacheux, Alain, Clarke, Tracy E., Higgins, Charles A., Panchenko, Mykhaylo, Dowell, Jayce, Imai, Kazumasa, Brazhenko, Anatolii I., Frantsuzenko, Anatolii V., and Konovalenko, Alexandr A.

Subjects
Astrophysics - Earth and Planetary Astrophysics, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

On 2015 February 21, simultaneous observations of Jupiter's decametric radio emission between 10 and 33 MHz were carried out using three powerful low-frequency radio telescopes: Long Wavelength Array Station One (LWA1) in USA; Nan\c{c}ay Decameter Array (NDA) in France; and URAN2 telescope in Ukraine. We measure lag times of short-bursts (S-bursts) for 105-minutes of data over effective baselines up to 8460 km by using cross-correlation analysis of the spectrograms from each instrument. Of particular interest is the measurement of the beaming thickness of S-bursts, testing if either flashlight- or beacon-like beaming is emanating from Jupiter. We find that the lag times for all pairs drift slightly as time elapses, in agreement with expectations from the flashlight-like beaming model. This leads to a new constraint of the minimum beaming thickness of 2.66". Also, we find that most of the analyzed data abound with S-bursts, whose occurrence probability peaks at 17-18 MHz., Comment: This is an author-created, un-copyedited version of an article accepted for publication/published in The Astrophysical Journal. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at doi: 10.3847/0004-637X/826/2/176

Published
2016
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4. Concurrent Jovian S‐Burst Beaming as Observed From LWA1, NDA, and Ukrainian Radio Telescopes

Author

Imai, Masafumi, primary, Lecacheux, Alain, additional, Clarke, Tracy E., additional, Higgins, Charles A., additional, Panchenko, Mykhaylo, additional, Zakharenko, Vyacheslav V., additional, Brazhenko, Anatolii I., additional, Frantsuzenko, Anatolii V., additional, Ivantyshin, Oleg N., additional, Konovalenko, Alexandr A., additional, and Koshovyy, Volodymyr V., additional

Published
2019
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5. Erratum: “The Beaming Structures of Jupiter's Decametric Common S-bursts Observed from the LWA1, NDA, and URAN2 Radio Telescopes” (2016, ApJ, 826, 176)

Author

Imai, Masafumi, primary, Lecacheux, Alain, additional, Clarke, Tracy E., additional, Higgins, Charles A., additional, Panchenko, Mykhaylo, additional, Dowell, Jayce, additional, Imai, Kazumasa, additional, Brazhenko, Anatolii I., additional, Frantsuzenko, Anatolii V., additional, and Konovalenko, Alexandr A., additional

Published
2018
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6. THE BEAMING STRUCTURES OF JUPITER’S DECAMETRIC COMMON S-BURSTS OBSERVED FROM THE LWA1, NDA, AND URAN2 RADIO TELESCOPES

Author

Imai, Masafumi, Lecacheux, Alain, Clarke, Tracy E., Higgins, Charles A., Panchenko, Mykhaylo, Dowell, Jayce, Imai, Kazumasa, Brazhenko, Anatolii I., Frantsuzenko, Anatolii V., Konovalenko, Alexandr A., Imai, Masafumi, Lecacheux, Alain, Clarke, Tracy E., Higgins, Charles A., Panchenko, Mykhaylo, Dowell, Jayce, Imai, Kazumasa, Brazhenko, Anatolii I., Frantsuzenko, Anatolii V., and Konovalenko, Alexandr A.

Abstract

On 2015 February 21, simultaneous observations of Jupiter's decametric radio emission between 10 and 33 MHz were carried out using three powerful low-frequency radio telescopes: the Long Wavelength Array Station One in the USA, the Nançay Decameter Array in France, and the URAN2 telescope in Ukraine. We measured the lag times of short-bursts (S-bursts) for 105 minutes of data over effective baselines of up to 8460 km by using cross-correlation analysis of the spectrograms from each instrument. Of particular interest is the measurement of the beaming thickness of S-bursts, testing if either flashlight- or beacon-like beaming is emanating from Jupiter. We find that the lag times for all pairs drift slightly as time elapses, in agreement with expectations from the flashlight-like beaming model. This leads to a new constraint of the minimum beaming thickness of 2farcs66. Also, we find that most of the analyzed data abound with S-bursts, whose occurrence probability peaks at 17–18 MHz.

Published
2016

13. IDENTIFICATION OF SATURN LIGHTNINGS RECORDED BY THE UTR-2 RADIO TELESCOPE AND CASSINI SPACECRAFT

Author

Zakharenko, V. V., primary, Mylostna, K. Y., additional, Fischer, G., additional, Konovalenko, Alexandr A., additional, Zarka, P., additional, Griebmeier, J.-M., additional, Ryabov, B. P., additional, Vavriv, Dmitry M., additional, Ryabov, V. B., additional, Rucker, H. O., additional, Ravier, P., additional, Sidorchuk, M. A., additional, Cecconi, B., additional, Coffre, A., additional, Denis, L., additional, Fabrice, C., additional, Kozhyn, R. V., additional, Mukha, D. V., additional, Pallier, L., additional, Schneider, J., additional, Shevchenko, V. A., additional, Vinogradov, V. V., additional, Weber, R., additional, and Nikolaenko, V. S., additional

Published
2011
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14. THE URAN DECAMETER RADIO TELESCOPE SYSTEM AS AN INSTRUMENT FOR SPACE WEATHER INVESTIGATIONS

Author

Fal'kovich, Igor Savel'evich, primary, Kalinichenko, Nikolai Nikolaevich, additional, Konovalenko, Alexandr A., additional, Yatskiv, Y. S., additional, Lytvynenko, Leonid M., additional, Melnik, V. N., additional, Olyak, M. R., additional, Dorovsky, V. V., additional, Brazhenko, A. I., additional, Lytvynenko, O. A., additional, Bubnov, I. N., additional, Gridin, A. A., additional, and Solov'ev, V. V., additional

Published
2011
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20. SOLAR S-BURSTS AT DECAMETER WAVELENGTHS

Author

Melnik, V. N., primary, Konovalenko, Alexandr A., additional, Rucker, H. O., additional, Dorovsky, V. V., additional, Abranin, E. P., additional, Lecacheux, A., additional, and Lonska, A. S., additional

Published
2010
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21. POLARIZATION OF DRIFTING PAIRS AT DECAMETER WAVES

Author

Brazhenko, A. I., primary, Melnik, V. N., additional, Konovalenko, Alexandr A., additional, Abranin, E. P., additional, Dorovsky, V. V., additional, Vashchishin, R. V., additional, Frantsuzenko, A. V., additional, Rucker, H. O., additional, and Lecacheux, A., additional

Published
2010
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