SAA域选划对天基探测卫星影响简析

通过仿真计算南大西洋异常区(SAA)高能粒子的通量与能量,分析不同通量阈值与能量阈值对SAA空间分布的影响,并以科学实验卫星为研究对象,对其历经SAA的时间百分比进行连续24 h和6个月的统计,获得了SAA对卫星常规运行的工作时间影响。结果表明:在50 MeV能量阈值条件下,500 cm~(-2)?s~(-1)较100 cm~(-2)?s~(-1)通量阈值对SAA空间分布的影响范围在纬度上相差约23.35%,经度上相差约27.06%,历经SAA时间上缩短约48.0%;在100 cm~(-2)?s~(-1)通量阈值条件下,150 MeV较50 MeV能量阈值对SAA空间分布的影响范围在纬度上相差约13.86%,经度上相差约17.29%,历经SAA时间上缩短约31.7%。

The influence of south atlantic anomaly boundary on space-based observation satellite

By simulating the South Atlantic Anomaly (SAA), the ranges of the SAA with different flux thresholds and energy thresholds are obtained. As an example, the time percentage of the space-based observation satellite that passes the SAA region is calculated in 24 consecutive hours and 6 months, and the influence of the SAA field on the operation time is evaluated. The results show that, for the 50 MeV energy threshold, with the maximum influence of the flux threshold on the spatial domain, the latitude difference is about 23.35%, the longitude difference is about 27.06%, and the SAA pass time difference is about 48% between 500 cm^-2·s^-1 and 100 cm^-2·s^-1 flux thresholds. For the 100 cm^-2·s^-1 flux threshold, the latitude difference is about 13.86%, the longitude difference is about 17.29%, and the SAA -pass time difference is about 31.7% between 150 MeV and 50 MeV energy thresholds.