地磁长期变化引起的低高度卫星轨道辐射带粒子环境的变化

LOW ALTITUDE SATELLITE ORBIT RADIAITION BELT PARTICLEENVIRONMENT VARIATION DUE TO GEOMAGNETIC LONG TERM VARIATION

利用ＩＧＲＦ２０００模式计算了几个典型轨道辐射带粒子环境并与ＩＧＲＦ１９７０模式计算的结果进行了比较．计算结果表明，在辐射带的低部，对应某些倾角的能量大于 ０．1ＭｅＶ质子的轨道积分通量变化达到 ２个量级，而能量大于 １０ ＭｅＶ的辐射带质子的轨道积分通量变化达到 １个量级；轨道积分通量的最大值变化为 １个量级．能量大于 ０．０４ ＭｅＶ辐射带电子的轨道积分通量变化在某些倾角达到 ３个量级，但轨道积分最大值的变化低于 １个量级． １０００ ｋｍ以上高度辐射带粒子环境的变化很小．

Several typical low altitude orbits' radiation belt particle environment have been computed by using IGRF2000 and compared with those of using IGRF1970. The results show that the orbit integral flax's variation for protons with energy greater than 0.1 MeV reaches two order of magnitude for some inclination at the current part of the radiation belt. While the orbit integral flux for protons with energy greater than 10MeV reaches an order of magnitude for some inclination at same location of the radiation belt. The orbit's proton integral flux maximum variation is an order of magnitude. The electron integral flux's variation reaches up to three order of magnitude for some inclination orbit at lowest radiation belt radiation belt. The electron integral flux's maximum vaxiation is one of magnitude lower. The particle environment variation is little at the altitude greater than 1000 km.