Variation of dependence of the cusp location at different altitude on the dipole tilt  

作　　者：GUO JianGuang SHI JianKui CHENG ZhengWei ZHANG ZiYing WANG Zheng ZHANG TieLong LIU ZhenXing DUNLOP Malcolm 

机构地区：[1]State Key Laboratory of Space Weather,Center for Space Science and Applied Research,Chinese Academy of Sciences [2]National Satellite Meteorology Center [3]Space Research Institute,Austrian Academy of Sciences [4]Rutherford Appleton Laboratory,Chilton

出　　处：《Chinese Science Bulletin》2013年第28期3541-3545,共5页

基　　金：supported by the National Natural Science Foundation of China(41004076,41274146 and 41074114);the Specialized Research Fund for State Key Laboratories

摘　　要：Using the Cluster cusp crossings data,dependence of the cusp location at the mid-altitude on the geomagnetic dipole tilt during northward IMF is studied.The results show that the cusp center moves 0.051°Invariant Latitude(ILAT)upon the increase of 1°in the dipole tilt angle at the average altitude of 5.8 RE(Earth radius).According to the present results obtained at the altitude of the Cluster orbit and previous results obtained at other altitudes of other satellite orbits,it is found that the higher the altitude in the cusp region is,the bigger the dependence of cusp location on the dipole tilt angle will be.If the altitude increases by 1 RE in the cusp region,the dependence will increase by 0.012°ILAT upon the increase of 1°in the dipole tilt angle.Some possible physical mechanisms are discussed and it shows that the cusp location will be more sensitive to the solar wind dynamic pressure if the altitude is high.Using the Cluster cusp crossings data, dependence of the cusp location at the mid-altitude on the geomagnetic dipole tilt during northward IMF is studied. The results show that the cusp center moves 0.051° Invariant Latitude （ILAT） upon the increase of 1° in the dipole tilt angle at the average altitude of 5.8 RE （Earth radius）. According to the present results obtained at the altitude of the Cluster orbit and previous results obtained at other altitudes of other satellite orbits, it is found that the higher the altitude in the cusp region is, the bigger the dependence of cusp location on the dipole tilt angle will be. If the altitude increases by 1 RE in the cusp region, the dependence will increase by 0.012° ILAT upon the increase of 1° in the dipole tilt angle. Some possible physical mechanisms are discussed and it shows that the cusp location will be more sensitive to the solar wind dynamic pressure if the altitude is high.

关 键 词：磁偶极子 海拔高度 风口 位置 倾斜角度 轨道高度 地球半径 物理机制 

分 类 号：P353[天文地球—空间物理学]