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.
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.
出处
《地球物理学报》
SCIE
EI
CAS
CSCD
北大核心
1993年第3期277-286,共10页
Chinese Journal of Geophysics
基金
国家自然科学基金
关键词
等离子体
稳定性
中纬电离层
赤道
Plasma, Rayleigh-Taylor instability, Drift instability, Mid-latitude,Equator.
