不同地磁活动期间地球同步轨道

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。

Analysis on energetic electron flux in GEO during different geomagnetic activities

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.