GEOS-2卫星S329和S301实验所得对流图象的综合分析与比较

本文对GEOS-2卫星S329电子枪实验和S301冷等离子体电子浓度实验所得对流图象进行了综合分析比较.比较是通过Volland半经验模式将对流电场与等离子体层顶相联系的.两种观测都表明对流电场的西旋与K_p有关,并说明Volland模式在一级近似下较好地描述了同步轨道附近的对流情况.两种实验在高地磁活动时等离子体层顶大小方面有矛盾处.这种矛盾的可能原因是高磁扰日时等离子体层顶附近动力过程的复杂性.此外,S329实验所得的对流电场之晨昏不对称性也是值得注意的现象.

A Synthetical Study of Convection Pattern by Using Results from GEOS-2 S301 and S329 Experiments

Asynthetical study by using the results from the GEOS-2 electron gun experiment S329 and the relaxation sounding experiment S301 is made to discuss the convection pattern in the magnetosphere. The comparison and synthesis are carried out with the help of the Volland's semi-empirical model, which can connect the convection electric field with the shape and dimension of the cold plasma boundary (i. e. the plasmapause). The results of both experiments show a Kp-dependance of the westward rotation of the convection pattern and demonstrate the applicability of the Volland's model in describing the convectionselectric field around the synchronous orbit. The two observations arc contradictory in predicting the size cf the plasma-pause when Kp is high. This is possibly caused by the complexity of the dynamic processes around the plasmapause. The processes concerned and the dawndusk asymmetry of the E-field observed by the electron gun experiment are worthy of further study.