Long-Period Oscillations of the Solar Microwave Emission

被引：9
作者：
Kislyakova, K. G. [1 ]
Zaitsev, V. V. [2 ]
Urpo, S. [3 ]
Riehokainen, A. [3 ]
机构：
[1] Nizhnii Novgorod State Univ, Nizhnii Novgorod 603950, Russia
[2] Russian Acad Sci, Inst Appl Phys, Nizhnii Novgorod 603600, Russia
[3] Aalto Univ, Helsinki, Finland
来源：
ASTRONOMY REPORTS | 2011年 / 55卷 / 03期
关键词：
Brightness Temperature; Radio Emission; Astronomy Report; Parametric Resonance; Solar Radio Emission;
D O I：
10.1134/S1063772911030036
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Modulations of the microwave emission of the Sun at 11.7 GHz have been studied using more than 40 events observed in 2001 at the Metsahovi Radio Observatory. In nearly all the observed events, low-frequency modulations with periods of 3-90 min were detected. As a rule, simultaneous modulation of the emission at several frequencies was observed. One possible origin of such modulations with periods 5-10 min is parametric resonance arising in coronal magnetic loops as a result of interactions with the 5-min photospheric oscillations, while the long-period modulations could be a manifestation of sunspot oscillations. Torsional (v-mode) and radial (r-mode) oscillations have such periods. The frequency of occurrence of oscillations with the determined periods is considered, and a lower limit for the brightness temperature of the oscillations is estimated.
引用
收藏
页码：275 / 283
页数：9
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