中国地球同步卫星非日食表面电荷的次风暴负极限

IF 3.7 2区 地球科学 Space Weather Pub Date : 2024-01-30 DOI:10.1029/2023sw003780
Zhiyi Fu, Zhenpeng Su, Bin Miao, Zhiyong Wu, Yiren Li, Kai Liu, Xu Shan, Yuming Wang
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引用次数: 0

摘要

表面充电是造成航天器异常的最常见原因之一。航天器何时充电以及充电电位是空间天气中的两个重要问题。在这里,我们以一颗中国地球同步导航卫星为研究对象,通过低能离子谱仪测得的离子差通量推断出极负的表面充电电势。在没有远离午夜的日食效应的情况下,我们发现充电电势有一个负极限,这个负极限由前 2 小时的最大 SuperMAG 电射流指数决定。这种经验关系可以通过 1-50 keV 电子通量与亚暴强度的关系得到合理解释。非日食区域的其他内磁层航天器也可能存在类似的关系,这将有助于航天器工程和空间气象警报。
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A Substorm-Dependent Negative Limit of Non-Eclipse Surface Charging of a Chinese Geosynchronous Satellite
Surface charging is one of the most common causes of spacecraft anomalies. When and to what potential the spacecraft is charged are two important questions in space weather. Here, for a Chinese geosynchronous navigation satellite, we infer the extreme negative surface charging potentials from the ion differential fluxes measured by a low-energy ion spectrometer. Without the solar eclipse effect away from the midnight, the charging potentials are found to have a negative limit which is determined by the maximum SuperMAG electrojet index in the preceding 2 hr. Such an empirical relation can be reasonably explained by the dependence of 1–50 keV electron fluxes on substorm strength. Similar relations may also exist for other inner magnetospheric spacecraft in the non-eclipse region, which would be useful for spacecraft engineering and space weather alerts.
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