Response of magnetic fields at geosynchronous orbit and on the ground to the sudden changes of IMF B_Z  

作　　者：DONG YiXuan CAO JinBin LIU WenLong ZHANG Lei LI LiuYuan 

机构地区：[1]Beijing Institute of Spacecraft Environment Engineering [2]Space Science Institute, School of Astronautics, Beihang University [3]Institute of Telecommunication Satellite,China Academy of Space Technology

出　　处：《Science China(Technological Sciences)》2014年第2期360-367,共8页中国科学（技术科学英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.40931054 and 41174141);the National Basic Research Program of China("973" Program)(Grant No.2011CB811404)

摘　　要：The rapid change in the Earth’s magnetosphere caused by solar wind disturbances has been an important part of the solar wind-magnetosphere interaction.However most of the previous studies focused on the perturbation of the Earth’s magnetic field caused by solar wind dynamic pressure changes.In this paper,we studied the response of geosynchronous magnetic field and the magnetic field to the rapid southward turning of interplanetary magnetic field during the interval 1350 1420 UT on 7May 2007.During this event,BZ component of the interplanetary magnetic field decreased from 15 nT to 10 nT within 3 min(1403 1406 UT).The geosynchronous magnetic field measured by three geosynchronous satellites(GOES 10 12)first increased and then decreased.The variations of magnetic field strength in the morning sector(9 10 LT)were much larger than those in the dawn sector(5 LT).Meanwhile,the H components of geomagnetic field on the ground have similar response features but exhibit latitude and LT dependent variations.Compared with H components,the D components do not have regular variations.Although the solar wind dynamical pressure encounters small variations,the magnetic field both in space and on the ground does not display similar variations.Therefore,the increase of geomagnetic field in the dawn sector is caused by the southward turning of IMF(interplanetary magnetic field)BZ.These results will help to better understand the coupling process of geomagnetic filed and interplanetary magnetic field.

关 键 词：interplanetary magnetic field （IMF） solar wind geosynchronous orbit geomagnetic field 

分 类 号：P353[天文地球—空间物理学] V474.21[天文地球—地球物理学]