摘要
本文利用东亚地区12个中低纬电离层台站的测高仪观测数据,对1978年8月27日发生的一次典型磁暴期间电离层峰值高度和密度的变化进行了分析。采用滑动平均区分开电离层中不同时间尺度的扰动,分析了影响中低纬度电离层暴的几种扰动形态特征,并对其物理机制进行了讨论。结果表明:伴随磁暴急始的磁层压缩,电离层中表现出峰值密度增加和峰值高度下降;磁暴主相期间热层大气暴环流及其所引起的中性大气成分变化控制着电离层的大尺度负相暴形态,它能持续约4—5天;同时叠加有TID所引起的几小时尺度扰动;赤道异常峰附近台站还会受到驼峰南北移动的影响。
Using the ionosonde data at 12 stations in East Asia, the response of mid and low latitude ionosphere to geomagneitc storm is analyzed for a typical case of August 27, 1978. Four processes affecting the mid and low latitude ionospheric disturbance morphology are discussed. Accompany with SSC, their appears the sudden increase of the peak density and decrease of its height; the storm circulation causes negative phase usually appears at the main phase of geomagnetic storm with the decrease of the peak density and increase of its height; TID can cause the small scale disturbances superposed in negative phase; and the movement of the equqatorial anomaly crest caused by neutral wind or electric field disturbances is the most important factor to determine the ionospheric storm morphology at stations near the crest.
出处
《空间科学学报》
CAS
CSCD
北大核心
1993年第4期262-270,共9页
Chinese Journal of Space Science
关键词
磁暴
电离层暴
中低纬
物理机制
Magnetic storm, Ionospheric storm, Mid and low latitude, Physical mechanism
