| 中纬电离层的低频等离子体不稳定性 |
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| 引用本文： | 黄朝松,李钧.中纬电离层的低频等离子体不稳定性[J].地球物理学报,1993,36(3):277-286. |
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| 作者姓名： | 黄朝松 李钧 |
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| 作者单位： | 中国科学院武汉物理研究所, 武汉 430071 |
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| 摘 要： | 本文研究了中纬电离层Rayleigh-Taylor不稳定性和漂移不稳定性的基本性质.如果不存在中性风和背景电场,中纬Rayleigh-Taylor不稳定性的增长率比赤道相应条件下的小.中性风和电场对中纬Rayleigh-Taylor不稳定性有重要影响.当中性风速度达到10m/s时,其作用就超过了重力.漂移不稳定性也受到重力、中性风和电场的影响,离子-中性粒子碰撞能降低漂移不稳定性的增长率.本文的分析表明,在赤道电离层容易产生大尺度的Rayleigh-Taylor不稳定性,在中纬电离层易产生小尺度的漂移不稳定性.
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| 关 键 词： | 等离子体 Raleigh-Taylor不稳定性 漂移不稳定性 中纬电离层 赤道电离层 |
| 收稿时间： | 1991-08-13 |
LOW FREQUENCY PLASMA INSTABILITIES IN MID-LATITUDE F REGION |
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| HUANG CHAO-SONG LI JUN.LOW FREQUENCY PLASMA INSTABILITIES IN MID-LATITUDE F REGION[J].Chinese Journal of Geophysics,1993,36(3):277-286. |
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| Authors: | HUANG CHAO-SONG LI JUN |
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| Institution: | Wuhan Institute of Physics, Academia Sinica, Wuhan 430072 |
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| Abstract: | Fundamental properties of Rayleigh-Taylor instability and drift instability in the mid-latitude F region are studied. It is found that neutral wind and electric field have profound influences on the instabilities. The neutral wind is the most important term for driving the Rayleigh-Taylor instability in the mid-latitude even if the ionosphere does not tilt. The growth rate of the Rayleigh-Taylor instability at the mid-latitude is smaller than that in the equatorial F region when there are not neutral wind and electric field.The ion-neutral collisions can reduce the growth rate of the drift instability. It is shown that the large-scale Rayleigh-Taylor instability is excited more easily in the equatorial ionosphere and the small-scale drift instability dominates at the mid-latitude. |
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| Keywords: | Plasma Rayleigh-Taylor instability Drift instability Mid-latitude Equator |
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