Physics and modeling of asymmetric magnetosphere

(1)由奥斯特卫星获得的地磁场数据已从地球物理数据库传送并积累在一个硬盘阵列上。(2)开发了卫星数据分析软件。(3)DE-1卫星观测的数据也进行了分析，以检查磁场在磁层内的磁场对准电流的磁特征。(4)根据中纬度地区的地面地磁资料，估计了场向电流的分布及其季节变化。(5)利用Oersted卫星在中低纬的地磁观测资料，得到了极区净场向电流的地方时分布。经确认，净电流在当地时间中午之前流入电离层，并在午夜之前流出电离层。(6)通过对DE-1卫星高空地磁观测资料的分析，也证实了从昼侧流向夜侧的净场向电流的存在。(7)为了研究电离层电流结构，我们建立了SuperDARN数据库。

(1) The geomagnetic field data obtained by the Oersted satellite have been transferred from DMI and accumulated on a hard disk array.(2) The softwares for satellite data analysis have been developed.(3) The data observed by the DE-1 satellite are also analyzed to examine the magnetic signature of field-aligned current in the inner magnetosphere.(4) From the ground geomagnetic data obtained in mid-latitudes, the field-aligned currents distribution and their seasonal variation were estimated.(5) From the magnetic observation by the Oersted satellite at mid- and low-latitudes, we obtained the local time distribution of the net field-aligned currents in the polar region. It was confirmed that the net current flows into the ionosphere at the local time before noon and flows out from the ionospher before midnight.(6) From an analysis of the DE-1 satellite magnetic observation data at high-altitude, we could also confirm the existence of the net field-aligned currents flowing from dayside to nightside.(7) To investigate the ionospheric current structure, we constructed a database of SuperDARN dataset.