空间科学学报2018，Vol.38Issue(1)：29-36,8.DOI:10.11728/cjss2018.01.029
利用TIE-GCM模式计算电离层电流及夜间电离层磁场
Ionospheric Currents and Nightside Ionospheric Magnetic Fields Calculated by TIE-GCM
摘要
Abstract
In geomagnetic field mapping,the magnetic fields generated by the ionospheric currents are sources of interference that should be removed.In this paper,the ionospheric currents generated by neutral wind,gravity drift and pressure gradient are calculated by Thermosphere-Ionosphere-Electrodynamics General Circulation Model (TIE-GCM).The global current distribution is used to examine the magnetic field generated by the ionospheric currents at a specific location.The variation of the three components of the magnetic field with latitude has been analyzed.The results show that the current densities in the E layer,especially in the magnetic equator and polar regions,are as high as about 103 nA.m-2,while the current densities in the F layer are about 10 nA·m-2.The magnetic field between 50°N and 50°S induced by ionospheric currents is about several nT from 22:00 LT to 04:00LT in the magnetic quiet day (Kp ≤ 1),and the north-south and radial components of the ionospheric magnetic field are substantially larger than the east-west component.By comparing with CHAMP observation data,it is proven that the TIE-GCM has good performance in calculating ionospheric currents and magnetic fields at low and middle latitudes.However,the results are not very good at high latitudes and TIE-GCM should be improved in order to increase the calculating accuracy.关键词
TIE-GCM/电离层/电流/磁场/CHAMPKey words
TIE-GCM/Ionosphere/current/Magnetic field/CHAMP分类
天文与地球科学引用本文复制引用
刘学旺,李磊,张艺腾,薛洪波..利用TIE-GCM模式计算电离层电流及夜间电离层磁场[J].空间科学学报,2018,38(1):29-36,8.基金项目
国家自然科学基金青年科学基金项目(41404146)和国家重点研发计划项目(2016YFB0501503)共同资助 （41404146）
