A 30-Year Simulation of the Outer Electron Radiation Belt
A 30-Year Simulation of the Outer Electron Radiation Belt
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DOI：
10.1029/2018sw001981
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发表时间：
2018-10-01
影响因子：
3.7
通讯作者：
Meredith, N. P.
中科院分区：
文献类型：
--
作者：
Glauert, S. A.;Horne, R. B.;Meredith, N. P.
随着社会越来越依赖卫星技术，了解整个货车艾伦辐射带的辐射环境变得越来越重要。历史上，大多数卫星在低地球轨道或地球静止轨道（GEO）运行，但现在有100多颗卫星在中地球轨道（MEO）运行。此外，使用电动轨道提升到达地球同步轨道的卫星可能会在穿过辐射带中心的轨道上停留数百天。关于高能电子通量的长期数据很少，而高能电子通量是卫星内部充电的原因，可用于MEO。在这里，我们模拟了30年的内带外缘和GEO之间的电子通量。我们提出了一种方法，将地球同步运行环境卫星在地球同步轨道上测量的>2 MeV通量转换为微分通量谱，以提供外边界条件。使用伽利略在轨验证元素-B航天器进行的独立测量对所得到的模拟进行了验证;相关系数在0.72至0.88的范围内，L* 和能量范围内的技能得分在0.6至0.8之间。结果表明，一个明确的太阳活动周期的变化和填充的槽区域在活跃的条件下，最坏的情况下的频谱重叠，独立得出的限制极端事件。模拟提供了一种资源，可供卫星设计人员用来了解中地球轨道环境，可供空间保险公司用来帮助解决异常现象的原因，可供卫星运营商用来规划极端环境。
As society becomes more reliant on satellite technology, it is becoming increasingly important to understand the radiation environment throughout the Van Allen radiation belts. Historically most satellites have operated in low Earth orbit or geostationary orbit (GEO), but there are now over 100 satellites in medium Earth orbit (MEO). Additionally, satellites using electric orbit raising to reach GEO may spend hundreds of days on orbits that pass through the heart of the radiation belts. There is little long-term data on the high-energy electron flux, responsible for internal charging in satellites, available for MEO. Here we simulate the electron flux between the outer edge of the inner belt and GEO for 30 years. We present a method that converts the >2-MeV flux measured at GEO by the Geostationary Operational Environmental Satellites spacecraft into a differential flux spectrum to provide an outer boundary condition. The resulting simulation is validated using independent measurements made by the Galileo In-Orbit Validation Element-B spacecraft; correlation coefficients are in the range 0.72 to 0.88, and skill scores are between 0.6 and 0.8 for a range of L* and energies. The results show a clear solar cycle variation and filling of the slot region during active conditions and that the worst case spectrum overlaps that derived independently for the limiting extreme event. The simulation provides a resource that can be used by satellite designers to understand the MEO environment, by space insurers to help resolve the cause of anomalies and by satellite operators to plan for the environmental extremes.