The Secular Variation of the Center of Geomagnetic South Atlantic Anomaly and Its Effect on the Distribution of Inner Radiation Belt Particles

The Secular Variation of the Center of Geomagnetic South Atlantic Anomaly and Its Effect on the Distribution of Inner Radiation Belt Particles
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南大西洋地磁异常中心的长期变化及其对内辐射带粒子分布的影响

DOI:
10.1002/2017sw001687
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发表时间:
2017-11
期刊:
Space Weather
影响因子:
--
通讯作者:
Shi WeiHong
Shi WeiHong
中科院分区:
其他
文献类型:
--
作者:
Ye YuGuang;Zou Hong;Zong QiuGang;Chen HongFei;Wang YongFu;Yu XiangQian;Shi WeiHong

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本文对南大西洋异常的长期变化进行了综合分析。利用SAMPEX(Solar Anomalous and Magnetospheric Particle Explorer)/PET(Proton/Electron Telescope)对不同能量通道的质子通量测量,得到了南大西洋异常(SAA)的中心位置。结果与美国国家海洋和大气管理局/中能质子和电子探测器观测和国际地磁参考场12(IGRF 12)地磁场模型进行了比较。结果表明,不同能量的质子在不同高度上有不同的行为,而SAA的中心位置随高度变化。IGRF 12磁场可以在有限程度上解释这些观测结果。差异的可能原因进行了讨论。证实了SAA中心位置也受SAMPEX高度大气密度的影响。研究结果可为内辐射带模型的建立提供参考。
In this study, we carry out a comprehensive analysis of secular variation of the South Atlantic Anomaly. The center location of the South Atlantic Anomaly (SAA) is derived from the proton flux measurements of different energy channels by SAMPEX (Solar Anomalous and Magnetospheric Particle Explorer)/PET (Proton/Electron Telescope). The results are compared with National Oceanic and Atmospheric Administration/Medium Energy Proton and Electron Detector observations and the International Geomagnetic Reference Field 12 (IGRF12) geomagnetic field model. It is found that different energy protons have different behaviors while the center location of the SAA changes with altitude. The IGRF12 magnetic field can explain the observations to a limited extent. Possible reasons for the differences are discussed. It is confirmed that center location of the SAA is also affected by atmospheric density at SAMPEX altitudes. The results could be helpful for constructing inner radiation belt models.
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发表时间: 2011-09
影响因子: 2.6
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