Storm‐time electric field distribution in the inner magnetosphere
Storm‐time electric field distribution in the inner magnetosphere
复制标题
DOI：
10.1029/2006gl027510
复制
发表时间：
2006-11
影响因子：
5.2
通讯作者：
Yukitoshi Nishimura;A. Shinbori;Takayuki Ono;M. Iizima;Atsushi Kumamoto
中科院分区：
文献类型：
--
作者：
Yukitoshi Nishimura;A. Shinbori;Takayuki Ono;M. Iizima;Atsushi Kumamoto
利用Akebono/EFD资料研究了1989 ~ 1995年磁暴时内磁层电场的分布。在磁暴主相期间，强电场出现在晨、暮扇区L = 2 ~ L = 6之间，强度为2 ~ 4 mV/m，最大值出现在暮扇区L = 3处。在恢复期和弱扰动期，强电场区随着振幅的减小而向外移动。这种局部电场的结构与Volland-Stern电场模型有很大的不同，这表明除了大尺度对流电场之外，还存在另一种电场源。在安静期间，虽然电场相当遵循共转电场，但L = 3.5处的分布表明与纯共转有小的偏差。
The distribution of the storm‐time electric field in the inner magnetosphere has been investigated by using the Akebono/EFD data within a period from 1989 to 1995. During the main phase of geomagnetic storms, the strong electric field appears between L = 2 and L = 6 in both dawn and dusk sectors with the magnitude from 2 to 4 mV/m, and the maximum value appears at L = 3 in the dusk sector. During the recovery and weakly disturbed period, the region with intense electric field moves outward with decreasing the amplitude. This structure of the localized electric field is quite different from the Volland‐Stern electric field model, suggesting the existence of another electric field source other than the large‐scale convection electric field. During quiet periods, although the electric field fairly follows the corotation electric field, the distribution at L = 3.5 indicates a small deviation from pure corotation.