低轨道中等能量电子对地磁扰动的响应

低轨道高度上能量电子通量变化与地磁扰动程度密切相关.利用我国资源2号(ZY-2)03星空间环境监测分系统在轨工作期间所获得的能量电子探测数据,以及美国NOAA-15,NOAA-16,NOAA-17三颗卫星中等能量电子探测器自1998年以来积累的太阳同步轨道中等能量电子探测数据,结合地磁活动观测数据,对低轨道高度上中等能量电子对地磁扰动的响应特性进行了统计分析.结果表明,该区域的中等能量电子通量在磁暴、磁层亚暴期间有显著增强,增幅大小与地磁活动程度呈正相关关系,强磁暴期间增幅可达一个数量级左右,在响应时间上存在电子通量变化滞后于磁扰的时间特性. 

Response of Medium Energy Electrons Fluxes to Geomagnetic Disturbance at Low Orbit

According to the observational result of space electron environment, the medium energy electron fluxes of space radiation environment are modulated by geomagnetic activity at low earth orbit. In this paper we utilize the data of ZY-2 satellite Space Environment Monitor （SEM） system from 2004 to now, the data of American NOAA satellite （NOAA-15, NOAA-16, NOAA-17） SEM system Medium Energy Proton and Electron Detector （MEPED） from 1998 to now, and the observational result of geomagnetic activity to analyze the response characteristics of medium energy electrons fluxes to geomagnetic activity in the range of high-latitude at low earth orbit （about 500-900 km）. The results present that the fluxes of medium energy electrons are closely correlated with geomagnetic storms and substorms, the geomagnetic disturbance stronger, the enhancing of medium energy electron flux higher. While strong geomagnetic storms happen, the fluxes of medium energy electrons usually enhance 1 order of magnitude. And the absolute enhancements of daily averaged electron fluxes are correlated with the energy of electrons, the energy of electrons higher, the absolute enhancement of daily averaged electron flux larger. Usually, there is several days delay between the peak of geomagnetic disturbance and the peak of medium energy electrons fluxes.