Seasonal variation and geomagnetic storm index effects on the proton flux response in the South Atlantic Anomaly by test particle simulations

研究成果: ジャーナルへの寄稿学術誌査読

5 被引用数 (Scopus)

抄録

In order to estimate the proton flux variations occurring in the South Atlantic Anomaly (SAA) caused by the geodipole tilting angle and the Dst index variations, we performed three dimensional relativistic test particle simulations to calculate the trajectories of high-energy protons (70–180 MeV), where the static background magnetic field was calculated by the Tsyganenko models T01/TS05 combined with IGRF-12. As various parameters characterize the SAA proton flux, the study considered the maximum proton flux and the area of the SAA. Among many different parameters that define the space weather conditions, we considered the geodipole tilting angle and the Dst index. The numerical results showed that (1) the proton flux intensity was increased in the SAA for small geodipole tilting angles, which was confirmed by observations, and that (2) the proton flux intensity was also increased for significantly low Dst index.

本文言語英語
論文番号105808
ジャーナルJournal of Atmospheric and Solar-Terrestrial Physics
228
DOI
出版ステータス出版済み - 2月 2022

!!!All Science Journal Classification (ASJC) codes

  • 地球物理学
  • 大気科学
  • 宇宙惑星科学

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