Possible manifestation of large-scale transverse oscillations of coronal loops in solar microwave emission (Research Note)

被引：9

作者：

Khodachenko, M. L. ^{[1
]}

Kislyakova, K. G. ^{[2
]}

Zaqarashvili, T. V. ^{[1
,5
]}

Kislyakov, A. G. ^{[2
]}

Panchenko, M. ^{[1
]}

Zaitsev, V. V. ^{[3
]}

Arkhypov, O. V. ^{[4
]}

Rucker, H. O. ^{[1
]}

机构：

[1] Austrian Acad Sci, Space Res Inst, A-8010 Graz, Austria

[2] Lobachevsky State Univ, Nizhnii Novgorod, Russia

[3] Russian Acad Sci, Inst Appl Phys, Nizhnii Novgorod, Russia

[4] Natl Acad Sci Ukraine, Inst Radio Astron, UA-61002 Kharkov, Ukraine

[5] Chavchavadze State Univ, Abastumani Astrophys Observ, Tbilisi, Georgia

来源：

ASTRONOMY & ASTROPHYSICS | 2011年 / 525卷

基金：

美国国家科学基金会; 奥地利科学基金会;

关键词：

Sun: corona; Sun: flares; Sun: magnetic topology; Sun: oscillations; Sun: radio radiation; RADIATION; TRACE;

D O I：

10.1051/0004-6361/201014860

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Aims. We interpret long-periodic (minutes) modulations detected in solar microwave emission during flaring events as signatures of large-scale transverse oscillations of coronal loops. Methods. Our data analysis method is based methodologically on a sliding-window Fourier transform combined with the Vigner-Wille technique. We analyze three different events where TRACE detected post-flare oscillating loops (on Mar. 23, 2000; Sep. 15, 2001; Sep. 07, 2001) Results. For the transverse large-scale oscillatory motion of a loop, a properly located observer, in addition to the modulation caused by the emission diagram pattern motion at the main frequency of the loop oscillation, may detect a modulation at twice the frequency, produced by the varying magnetic field during each inclination of the loop. Our main result consists in identification of these "modulation pairs" in the dynamic spectra of solar microwave emission and their association with the observed oscillating coronal loops.

引用

页数：4

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