| 高能离子束流引起低频电磁波动的特性 |
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| 引用本文： | 汪学毅, 曹晋滨, 张效信, 周国成. 高能离子束流引起低频电磁波动的特性[J]. 地球物理学报, 2002, 45(01): 1-7, |
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| 作者姓名： | 汪学毅 曹晋滨 张效信 周国成 |
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| 作者单位： | 1. 中国科学院空间天气学开放研究实验室,北京,100080; 2. 中国科学院空间科学与应用研究中心,北京,100080 |
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| 摘 要： | 理论和数值模拟研究了日冕区高速低密离子束流与等离子体相互作用产生的低频电磁波动特征. 结果表明,在线性阶段,系统波动主要表现为短波长的非共振模的激发;在非线性阶段,长波模占优,短波长波逐渐衰减,此时系统波动表现为具有Alfvén波动特征,波的能谱为双幂律谱. 这些结果可用来解释太阳风中的Alfvén湍动现象.
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| 关 键 词： | 日冕 高能离子束流 低频电磁波 Alfvé 湍动 |
| 收稿时间： | 2001-04-27 |
| 修稿时间： | 2001-09-20 |
CHARACTERISTICS OF LOW FREQUENCY ELECTROMAGNETIC WAVES GENERATED BY HIGH ENERGY ION BEAM |
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| WANG XUE-YI, CAO JIN-BIN, ZHANG XIAO-XIN, GUO-CHENG. CHARACTERISTICS OF LOW FREQUENCY ELECTROMAGNETIC WAVES GENERATED BY HIGH ENERGY ION BEAM[J]. Chinese Journal of Geophysics (in Chinese), 2002, 45(01): 1-7, |
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| Authors: | WANG XUE-YI CAO JIN-BIN ZHANG XIAO-XIN GUO-CHENG |
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| Affiliation: | 1. Laboratory f or Space Weather of Chinese Academy of Sciences, Beijing 100080, China; 2. Center f or Space Sci ence and Applied Research, CAS, Beijing 100080, China |
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| Abstract: | This paper studied low frequency electromagnetic waves generated by the ion beams with high speed and low density in the coronal region by computer simulation and analytic method. Results show that in the linear phase, nonresonant mode of short wavelength is excited. In the nonlinear phase, long wavelength mode dominates, while short wavelength mode gradually decreases and waves display the features of Alfvén waves. These results can be used to explain the turbulence phenomena in the solar wind. |
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| Keywords: | Corona High energy ion beam Low frequency plasma waves Alfvén turbulence |
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