UNUSUAL SOLAR DECAMETER RADIO BURSTS WITH HIGH FREQUENCY CUT OFF

Solar bursts with high frequency cut off were observed by the URAN-2 radio telescope (Poltava, Ukraine) on 18 August, 2012 in the frequency range 8-32 MHz. Durations of these bursts changed from 30 to 70 s. It is much longer than that for standard type III bursts. Drift rates are much smaller than t...

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Main Authors:	A. I. Brazhenko, V. M. Melnik, A. V. Frantsuzenko, H. O. Rucker, M. Panchenko
Format:	Article
Language:	English
Published:	National Academy of Sciences of Ukraine, Institute of Radio Astronomy 2015-03-01
Series:	Radio Physics and Radio Astronomy
Subjects:	sun radio emission decameter wavelengths “caterpillar” bursts duration frequency drift polarization plasma mechanism of radio emission
Online Access:	http://rpra-journal.org.ua/index.php/ra/article/view/1198/834

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spelling	doaj-76f27a79a6e143a3b35ed73f0454146b2021-02-04T08:59:29ZengNational Academy of Sciences of Ukraine, Institute of Radio AstronomyRadio Physics and Radio Astronomy1027-96362415-70072015-03-012011019https://doi.org/10.15407/rpra20.01.010UNUSUAL SOLAR DECAMETER RADIO BURSTS WITH HIGH FREQUENCY CUT OFFA. I. Brazhenko0V. M. Melnik1A. V. Frantsuzenko2H. O. Rucker3M. Panchenko4Poltava Gravimetric Observatory, S. Subbotin Institute of Geophysics, National Academy of Sciences of Ukraine, 27/29, Miasoiedov St., Poltava, 36014, UkraineInstitute of Radio Astronomy, National Academy of Sciences of Ukraine, 4, Mystetstv St., Kharkiv, 61002, UkrainePoltava Gravimetric Observatory, S. Subbotin Institute of Geophysics, National Academy of Sciences of Ukraine, 27/29, Miasoiedov St., Poltava, 36014, UkraineInstitut für Weltraumforschung, Österreichische Akademie der Wissenschaften, Schmiedlstraße 6, Graz, 8042, Österreich, AustriaInstitut für Weltraumforschung, Österreichische Akademie der Wissenschaften, Schmiedlstraße 6, Graz, 8042, Österreich, AustriaSolar bursts with high frequency cut off were observed by the URAN-2 radio telescope (Poltava, Ukraine) on 18 August, 2012 in the frequency range 8-32 MHz. Durations of these bursts changed from 30 to 70 s. It is much longer than that for standard type III bursts. Drift rates are much smaller than those of type III bursts are, though much larger than those for decameter type II bursts. In some cases, the drift rate sign changes from the negative to positive one. Some of these bursts have fine structures. Stripes of the fine structures have small drift rates of 20-40 kHz/s. Polarizations of these bursts made about 10 % that apparently indicates that they are generated at the second harmonic of the local plasma frequency. The connection of bursts with the high frequency cut off with compact ejections from the behind-limb active regions is confirmed.http://rpra-journal.org.ua/index.php/ra/article/view/1198/834sunradio emissiondecameter wavelengths“caterpillar” burstsdurationfrequency driftpolarizationplasma mechanism of radio emission
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	A. I. Brazhenko V. M. Melnik A. V. Frantsuzenko H. O. Rucker M. Panchenko
spellingShingle	A. I. Brazhenko V. M. Melnik A. V. Frantsuzenko H. O. Rucker M. Panchenko UNUSUAL SOLAR DECAMETER RADIO BURSTS WITH HIGH FREQUENCY CUT OFF Radio Physics and Radio Astronomy sun radio emission decameter wavelengths “caterpillar” bursts duration frequency drift polarization plasma mechanism of radio emission
author_facet	A. I. Brazhenko V. M. Melnik A. V. Frantsuzenko H. O. Rucker M. Panchenko
author_sort	A. I. Brazhenko
title	UNUSUAL SOLAR DECAMETER RADIO BURSTS WITH HIGH FREQUENCY CUT OFF
title_short	UNUSUAL SOLAR DECAMETER RADIO BURSTS WITH HIGH FREQUENCY CUT OFF
title_full	UNUSUAL SOLAR DECAMETER RADIO BURSTS WITH HIGH FREQUENCY CUT OFF
title_fullStr	UNUSUAL SOLAR DECAMETER RADIO BURSTS WITH HIGH FREQUENCY CUT OFF
title_full_unstemmed	UNUSUAL SOLAR DECAMETER RADIO BURSTS WITH HIGH FREQUENCY CUT OFF
title_sort	unusual solar decameter radio bursts with high frequency cut off
publisher	National Academy of Sciences of Ukraine, Institute of Radio Astronomy
series	Radio Physics and Radio Astronomy
issn	1027-9636 2415-7007
publishDate	2015-03-01
description	Solar bursts with high frequency cut off were observed by the URAN-2 radio telescope (Poltava, Ukraine) on 18 August, 2012 in the frequency range 8-32 MHz. Durations of these bursts changed from 30 to 70 s. It is much longer than that for standard type III bursts. Drift rates are much smaller than those of type III bursts are, though much larger than those for decameter type II bursts. In some cases, the drift rate sign changes from the negative to positive one. Some of these bursts have fine structures. Stripes of the fine structures have small drift rates of 20-40 kHz/s. Polarizations of these bursts made about 10 % that apparently indicates that they are generated at the second harmonic of the local plasma frequency. The connection of bursts with the high frequency cut off with compact ejections from the behind-limb active regions is confirmed.
topic	sun radio emission decameter wavelengths “caterpillar” bursts duration frequency drift polarization plasma mechanism of radio emission
url	http://rpra-journal.org.ua/index.php/ra/article/view/1198/834
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UNUSUAL SOLAR DECAMETER RADIO BURSTS WITH HIGH FREQUENCY CUT OFF

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