不同地磁活动期间地球同步轨道高能电子通量分析  

Analysis on energetic electron flux in GEO during different geomagnetic activities

作　　者：田天[1] 焦维新[1] 王永福[1] 

机构地区：[1]北京大学地球与空间科学学院,北京100871

出　　处：《航天器环境工程》2008年第2期114-119,97,共6页Spacecraft Environment Engineering

基　　金：国家自然科学基金项目(编号:40674097)

摘　　要：文章利用地球同步轨道GOES6～12卫星1986-2006年约两个太阳活动周期的高能电子角通量密度数据,分析了在地磁平静期或不同程度磁暴期间高能电子通量的变化,为建立更精确的航天器内部充电动态模型奠定基础。研究结果表明:地球同步轨道高能电子通量随太阳活动周期的变化规律表现为,在太阳活动极大年通量较低,极小年反而较高;高能电子通量随季节的变化规律表现为,在冬至和夏至附近通量达到最低值,春秋分附近达到最高值;Dst指数最小时,对应的高能电子通量一般较低。In this paper,differential flux data of energetic(>2MeV) electron of GOES 6～12 during 1986-2006 are used to obtain the flux variation with season and solar cycle at different phases of geomagnetic storm,which in turn can be used for building a more accurate dynamic spacecraft internal charging model. The results show that for different geomagnetic activities,the worst-case electron flux is lower in the solar maximum year while higher in the solar minimum year;the worst-case electron flux reaches its lowest values near summer and winter solstices,while reaches its peak values near vernal and autumnal equinoxes;the energetic electron flux is usually low when Dst index is small.

关 键 词：地球同步轨道 高能电子 粒子辐射度 DST指数 

分 类 号：V520.5[航空宇航科学与技术—人机与环境工程]