Proton loss of inner radiation belt during geomagnetic storm of 2018 based on CSES satellite observation
Proton loss of inner radiation belt during geomagnetic storm of 2018 based on CSES satellite observation
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基于CSES卫星观测的2018年地磁暴期间内辐射带质子损失
DOI：
10.1088/1674-1056/ac1f00
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发表时间：
2021-08
影响因子：
1.7
通讯作者：
Wang Yongfu
中科院分区：
文献类型：
--
作者：
Zhang Zhenxia;Shen Xuhui;Li Xinqiao;Wang Yongfu
内辐射带质子分布常受到强烈地磁暴扰动的影响。基于2018年2月发射的携带多个高能粒子有效载荷的太阳同步CSES卫星的数据，我们分析了2018年重大地磁暴期间内辐射带在2 MeV~220 MeV宽能量范围内的广泛质子变化。结果表明，质子的损失机制是能量依赖性的，这与之前的一些研究是一致的。对于低能2 MeV-20 MeV的质子，在风暴的主要阶段通量减少，并且在恢复阶段没有很快返回，这可能是由于中性大气密度变化引起的库仑碰撞造成的。在较高能量30 MeV-100 MeV下，证实磁场线曲率散射在这次风暴的质子损失现象中起着重要作用。在> 100 MeV的最高能量下，质子通量保持稳定水平，并且在这次风暴中没有表现出明显的损失。
The proton distribution in inner radiation belt is often affected by strong geomagnetic storm disturbance. Based on the data of the sun-synchronous CSES satellite, which carries with several high energy particle payloads and was launched in February 2018, we analyzed the extensive proton variations in the inner radiation belt in a wide energy range of 2 MeV–220 MeV during 2018 major geomagnetic storm. The result indicates that the loss mechanism of protons was energy dependence which is consistent with some previous studies. For protons at low energy 2 MeV–20 MeV, the fluxes were decreased during main phase of the storm and did not come back quickly during the recovery phase, which is likely to be caused by Coulomb collision due to neutral atmosphere density variation. At higher energy 30 MeV–100 MeV, it was confirmed that the magnetic field line curvature scattering plays a significant role in the proton loss phenomenon during this storm. At highest energies> 100 MeV, the fluxes of protons kept a stable level and did not exhibit a significant loss during this storm.