太阳风参数对极光电集流中心纬度变化的影响

Impact of solar wind parameters on latitude variations of auroral electrojet centers

为了认识并了解磁层能量输入对极光电集流中心纬度变化的影响,本文使用1998-2006年的SuperMAG、OMNI以及EPI数据分别分析了西向和东向电集流中心纬度与行星际磁场Bz分量、太阳风速度、以及极光沉降粒子估算能量的变化特征.研究结果表明:(1)当Bz<0时,磁场强度越大,西向和东西电集流中心纬度越低,西向电集流朝晨侧移动,东向电集流朝正午方向移动;(2)在Bz>0时,电集流中心主要受太阳风速度控制,当太阳风速度较大时,电集流中心向低纬移动;(3)电集流中心纬度随其强度的变化特征与随EPI的变化特征一致.

In order to know more about the magnetospheric energy input＇s effect on the latitude variations of auroral electrojet center,the relations of the latitude variations of west and east auroral electrojet with interplanetary magnetic Bz component（IMF Bz）,solar wind velocity,and estimated power input（EPI） of auroral particles are studied respectively.The data of SuperMAG,OMNI and EPI from 1998-2006 are employed.The main results are：（1） As Bz〈0,the more Bz enhances,the lower the latitudes of west and east auroral electrojet centers are.Meanwhile,the west electrojet center shift to dawn side and east electrojet center to noon.（2） For Bz〉0,electrojet centers are mainly controlled by the solar wind velocity.Their centers are also migrating equatorward as the velocity grows faster.（3） The characteristics of auroral electrojet center obtained by its strength are consistent with the results got by EPI data.