Evaluation of the proton contamination to MeV electrons by solar proton events based on CSES observations
Evaluation of the proton contamination to MeV electrons by solar proton events based on CSES observations
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基于CSES观测的太阳质子事件对MeV电子的质子污染评估
DOI：
10.1029/2022ja030550
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发表时间：
2022
期刊：
影响因子：
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通讯作者：
Wen Xiangyang
中科院分区：
文献类型：
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作者：
Zhang Zhenxia;Li Xinqiao;Wang Lu;Zeren Zhima;Shen Xuhui;Yuan Shigeng;An Zhenghua;Xu Yanbing;Liang Xiaohua;Zhang Dali;Wang Ping;Wen Xiangyang
中国地震电磁卫星（CSES）搭载的高能粒子包（HEPP）由三个子系统组成：HEPP-H、HEPP-L和HEPP-X。 HEPP-H 和 HEPP-L 检测 0.1–55 MeV 电子和 2–230 MeV 质子。 HEPP-X 用于监测 0.9–35 keV 太阳 X 射线。本研究的主要目的是介绍测量技术和仪器参数，展示这些仪器记录的粒子观测的主要特征，并评估质子对 MeV 电子的污染。基于CSES观测，我们报告了一次典型的太阳X射线和太阳质子事件，并与极地轨道环境卫星（POES）和地球静止运行环境卫星（GOES）卫星的观测结果进行了比较。基于对太阳质子事件的观测，我们提出了一种利用高L壳上相对纯净的质子样本来评估质子污染水平的方法，其中在安静时质子通量接近于零。被 HEPP-H 错误识别为电子的质子百分比估计约为 0.022%。在外辐射带区域，质子污染仅占 L = 4 时观测到的电子总数的不超过 10%，能量范围为 8-9 MeV。因此，我们认为HEPP仪器的在轨性能满足了设计预期，为空间天气研究和自然灾害监测等领域的科学应用提供了大量高质量的高能粒子观测数据和参考。
The high energy particle package (HEPP) onboard the China Seismo-Electromagnetic Satellite (CSES) consists of three subsystems: HEPP-H, HEPP-L, and HEPP-X. HEPP-H and HEPP-L detect 0.1–55 MeV electrons and 2–230 MeV protons. HEPP-X is used to monitor 0.9–35 keV solar X-rays. The primary objective of this study is to present the measurement techniques and instrument parameters, show the main features of particle observations recorded by these instruments and evaluate the proton contamination to MeV electrons. Based on CSES observation, we report a typical solar X-ray and solar proton event and compare with observations from Polar Orbiting Environmental Satellites (POES) and Geostationary Operational Environmental Satellites (GOES) satellite. Based on the observations of solar proton events, we put forward one method to evaluate the proton contamination level using comparatively pure proton samples on high L-shells where the proton flux is near zero at quiet time. The percentage of protons that are mistakenly identified to be electrons by HEPP-H is estimated to be approximately 0.022%. The proton contaminations only contribute no more than 10% of the total observed electron populations at L = 4 with energy range 8–9 MeV in the outer radiation belt region. Therefore, we conclude that the on-orbit performance of HEPP instrument has satisfyingly .met the design expectations by providing plenty of high-quality high energy particle observation data and reference for scientific uses in the fields of space weather research and natural hazard monitoring.