Storm Phase Dependence of Penetration of Magnetospheric Electric Fields to Mid and Low Latitudes
Storm Phase Dependence of Penetration of Magnetospheric Electric Fields to Mid and Low Latitudes
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DOI：
10.1029/181gm14
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发表时间：
2013-03
期刊：
影响因子：
--
通讯作者：
T. Kikuchi;K. Hashimoto;K. Nozaki
中科院分区：
文献类型：
--
作者：
T. Kikuchi;K. Hashimoto;K. Nozaki
利用来自高赤道纬度的磁强计数据，研究了三个地磁暴的磁层电场对赤道电离层的穿透情况，磁暴的特征是主相的赤道DP2电流和恢复早期的反电喷流。赤道DP2与环流开始同时开始，并在主位相持续2-3h，表明在环流发展期间对流电场瞬时传输到赤道。但是，赤道DP2在主位相后期随着极光电喷流(AEJ)的增加而减小，当AEJ在恢复阶段开始快速向极地移动时，赤道DP2转变为CEJ。结果表明，与DP2电流相关的电场可能起到驱动环电流的作用，而负责CEJ的过屏蔽有助于减少负责环电流发展的电场。
Penetration of the magnetospheric electric fields to the equatorial ionosphere was examined using magnetometer data from high-equatorial latitudes for three geomagnetic storms characterized by the equatorial DP2 current during the main phase and the counter electrojet (CEJ) during the early recovery phase. The equatorial DP2 started simultaneously with the onset of the ring current, and continued for 2-3 h during the main phase, indicating instantaneous transmission of the convection electric field to the equator for the period of ring current development. However, the equatorial DP2 decreased its magnitude concurrently with increase in the auroral electrojet (AEJ) during the late main phase, and changed into the CEJ when the AEJ moved rapidly poleward at the beginning of the recovery phase. It is suggested that the electric field associated with the DP2 current may play a role in driving the ring current, and that the overshielding responsible for the CEJ contributed to reduce electric fields responsible for ring current development.