低轨航天器运行环境质子通量预测模型对比研究

辐射带粒子环境是导致航天器故障和异常的重要因素。为此，需要对辐射带粒子环境及其通量分布进行研究。文章主要研究低地球轨道（LEO）环境辐射带质子分布情况。分析了目前用来计算质子通量的几种常用模型的优缺点；利用各模型计算了不同轨道的质子通量，对计算结果进行了比较；总结了进行不同高度、不同能量范围的质子通量计算时，选择不同模型的依据原则。

Comparison of the proton flux calculation models in LEO spacecraft operation environment

The trapped particle in earth＇s radiation belts is an important factor for the abnormity of spacecraft, so it is necessary to study its distribution in earth＇s radiation belts. The operational environment of the LEO spacecraft is the inner radiation belt, which is the closest trapped charged particle zone from the Earth, mainly composed of protons of above 10 MeV. This paper mainly concerns the proton distribution in the radiation belt where the LEO spacecraft operates and the current status of the radiation belt modeling. The models commonly adopted for computing the proton flux at present are discussed. They are developed in different periods with different characteristics, and the energy ranges as well as the advantages and disadvantages of each of the models are analyzed. The proton fluxes of different orbits are computed by the models and the results are compared. The proton fluxes should be computed through different models, according to different requirements of different orbital altitudes and energy ranges.