| 太阳spike辐射中的MHD振荡 |
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| 引用本文： | 赵仁扬,金声震,傅其骏,李小聪.太阳spike辐射中的MHD振荡[J].中国天文和天体物理学报,1991(3). |
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| 作者姓名： | 赵仁扬 金声震 傅其骏 李小聪 |
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| 作者单位： | 中国科学院北京天文台
(赵仁扬，金声震，傅其骏)，中国科学院北京天文台(李小聪) |
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| 摘 要： | 我们在1981年5月16日所观测到的典型的微波大爆发的spike辐射中,发现存有～1.4—1.6秒的准周期振荡特征。本文依据MHD波理论,对观测进行了分析讨论,本文认为在日冕圈内外传播着的快磁声波(“腊肠”模)调制了源区的磁场以及电子束的投射角分布,从而影响了ECM不稳定性的增长率,因此而产生了spike辐射中的准周期振荡。另外,本文还对一些有关的物理参数作了定量的估算。
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| 关 键 词： | 太阳射电 spike 辐射 MHD 振荡 |
MHD Oscillations in Solar Radio Spike Radiation |
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| Zhao Renyang Jin Shengzhen Fu Qijun Li Xiaocong.MHD Oscillations in Solar Radio Spike Radiation[J].Chinese Journal of Astronomy and Astrophysics,1991(3). |
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| Authors: | Zhao Renyang Jin Shengzhen Fu Qijun Li Xiaocong |
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| Abstract: | In the solar spike radiation of the typical microwave outburst observed on May 16, 1981, we found the presence of 1.4-1.6s quasi-periodic oscillations. In the present paper, the observations are analysed in terms of the theory of MHD waves. We considered that the fast mag-netoacoustic waves ("sausage" mode) propagating inside and outside a loop can modulate the magnetic field and the pitch angle distribution of the electron beams in the source region. These affect the growth rates of the ECM instability and give rise to the quasi-periodic oscillations in the spike radiation. In addition, we quantitatively estimated some relevant physical parameters. |
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| Keywords: | solar radio radiation-spike radiation-MHD oscillations |
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