Počet záznamů: 1
Frequency variations of solar radio zebras and their power-law spectra
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SYSNO ASEP 0429504 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Frequency variations of solar radio zebras and their power-law spectra Tvůrce(i) Karlický, Marian (ASU-R) RID, ORCID Zdroj.dok. Astronomy & Astrophysics. - : EDP Sciences - ISSN 0004-6361
Roč. 561, January (2014), A34/1-A34/4Poč.str. 4 s. Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. FR - Francie Klíč. slova Sun ; radio radiation ; plasmas Vědní obor RIV BN - Astronomie a nebeská mechanika, astrofyzika CEP GAP209/12/0103 GA ČR - Grantová agentura ČR Institucionální podpora ASU-R - RVO:67985815 UT WOS 000330584000034 DOI 10.1051/0004-6361/201322547 Anotace Power spectra of the frequency variations of zebras are computed to estimate the spectra of the plasma density variations in radio zebra sources. Methods: Frequency variations of zebra lines and the high-frequency boundary of the whole radio burst were determined with and without the frequency fitting. The computed time dependencies of these variations were analyzed with the Fourier method. First, we computed the variation spectrum of the high-frequency boundary of the whole radio burst, which is composed of several zebra patterns. This power spectrum has a power-law form with a power-law index -1.65. Then, we selected three well-defined zebra-lines in three different zebra patterns and computed the spectra of their frequency variations. The power-law indices in these cases are found to be in the interval between -1.61 and -1.75. Finally, assuming that the zebra-line frequency is generated on the upper-hybrid frequency and that the plasma frequency omegape is much higher than the electron-cyclotron frequency omegace, the Fourier power spectra are interpreted to be those of the electron plasma density in zebra radio sources. Pracoviště Astronomický ústav Kontakt Radka Svašková, bibl@asu.cas.cz, Tel.: 323 620 326 Rok sběru 2015
Počet záznamů: 1