东北亚地区电离层ELF/VLF电场的动态背景场研究  

Analysis on dynamic background field of ionosphere ELF/VLF electric field in Northeast Asia

作　　者：杨牧萍 黄建平[2] 张学民[3] 申旭辉[2] 王兰炜[2] 泽仁志玛[3] 钱庚 翟丽娜[1] YANG Mu-ping;HUANG Jian-ping;ZHANG Xue-min;SHEN Xu-hui;WANG Lan-wei;ZEREN Zhi-ma;QIAN Geng;ZHAI Li-na(Earthquake Administration of Liaoning Province,Shenyang 110034,China;Instttute of Crustal Dynamics,China Earthquake Administration,Beijing 100085,China;Institute of Earthquake Science,China Earthquake Administration,Beijing 100036,China;Key Laboratory Earthquake Geodesy,Institute of Seismology,CEA ,Wuhan 430071,China)

机构地区：[1]辽宁省地震局,沈阳110034 [2]中国地震局地壳应力研究所,北京100085 [3]中国地震局地震预测研究所,北京100036 [4]中国地震局地震研究所(地震大地测量重点实验室),武汉430071

出　　处：《地球物理学进展》2018年第6期2285-2294,共10页Progress in Geophysics

基　　金：政府间国际科技创新合作重点专项(2016YFE0122200);国家民用航天科研工程项目"地面数据验证技术研发"第一课题"电磁卫星观测理论模型研究"联合资助

摘　　要：利用2005年1月—2009年12月DEMETER卫星观测的极低频/甚低频(ELF/VLF)40 Hz～6 kHz频段的电场功率谱密度数据,对空间天气平静期间(D_(st)>-30 nT,K_p<3)东北亚地区(105°E—145°E;38°N—58°N)电离层电场背景场变化特征进行统计研究.研究发现夜侧不同年份的相同月份、相同频段的电场分布特征有较高相似度,昼侧相似度不如夜侧;不同年份的相同月份、相同频段昼侧背景场和夜侧背景场强度变化范围均较为一致,从2005年开始东北亚地区的ELF/VLF频段的电场强度呈现逐年递减的趋势;夜侧电场背景场具有季节变化特征:背景场强度变化从强到弱分别是夏季、冬季、春季和秋季,昼侧电场季节变化规律则不明显;电场背景场除371～879 Hz这个频段外,其他频段夜侧强度均强于昼侧强度.The power spectrum density data of the electric field in the ELF/VLF frequency band (40 Hz -6kHz)recorded by the microsatellite DEMETER from January 2005 to February 2009 is utilized to carry out statistical analysis about the evolutional characteristics of the electric background field in ionosphere with geomagnetic active indexes Dst >-30nT and Kp <3 in Northeast Asia region(105°E-145°E;38°N-58°N).The analysis shows spatial distributions of the nightside eleetric field in the same month of different years and in the same frequency band have good similarity,and the similarity of dayside is not as good as that of nightside;The intensity range of both dayside and nightside background is consistent in the same month of different years and in the same frequency band,and the electric field intensity in the ELF/VLF frequency band is decreasing year by year from 2005 in Northeast Asia;The nightside background field has seasonal variation characteristics,and the summer is strongest and then from strong to weak are winter,spring and autumn.And the seasonal variation of dayside electric field is not obvious;The frequency band intensity analyzed of the nightside background field is stronger than that of the dayside background field except the band (371 - 879Hz).

关 键 词：DEMETER卫星 ELF/VLF电场功率谱 东北亚地区 变化特征 电离层背景场 

分 类 号：P352[天文地球—空间物理学]