Latitudinal shift and tilt of the ring current during magnetic storms  

作　　者：CHEN BO XU WenYao CHEN GengXiong DU AiMin WU YingYan LIU XiaoCan 

机构地区：[1]Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China [2]Graduate University of Chinese Academy of Sciences, Beijing 100049, China [3]National Satellite Meteorological Center, China Meteorological Administration, Beijing 100081, China

出　　处：《Chinese Science Bulletin》2009年第1期95-103,共9页

基　　金：Supported by National Natural Science Foundation of China (Grant No.40436016);KIP Pilot Project of the Chinese Academy of Sciences (Grant No.KZCX3-SW-144);National Basic Research Program of China (Grant No.2006CB806305)

摘　　要：The equatorial ring current (ERC) theory suggested that the distribution of global disturbed horizontal geomagnetic field only depends on the cosine of station’s latitude. However,we always observe a lar-ger ΔH at higher latitude stations than lower ones,implying that the ERC could tilt or/and shift with respect to the equatorial plane during intense storms. In this paper,we analyze 11 intense magnetic storms from 2000 to 2004,and introduce two configurational factors to characterize the topology of storm time ring current. The results show that ERC has occasionally deviated off equatorial plane with both tilt angle δt≈13°―25° and latitude shift δs≈0°―21.8°. The ground disturbed field distribution should be improved as ΔHk = ΔHmaxcos(k-δ ),which agree well with the geomagnetic observations.The equatorial ring current （ERC） theory suggested that the distribution of global disturbed horizontal geomagnetic field only depends on the cosine of station＇s latitude. However, we always observe a larger △H at higher latitude stations than lower ones, implying that the ERC could tilt or/and shift with respect to the equatorial plane during intense storms. In this paper, we analyze 11 intense magnetic storms from 2000 to 2004, and introduce two configurational factors to characterize the topology of storm time ring current. The results show that ERC has occasionally deviated off equatorial plane with both tilt angle δt≈13°-25° and latitude shift δs≈0°-21.8°. The ground disturbed field distribution should be improved as ,△Hk = △Hmaxcos（φk-δ）, which agree well with the geomagnetic observations.

关 键 词：赤道 地磁反转 组态 地理纬度 磁暴 

分 类 号：P318[天文地球—固体地球物理学]