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- W4226159027 abstract "In order to estimate the proton flux variations occurring in the South Atlantic Anomaly (SAA) caused by the geodipole tilting angle and the D s t 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 D s t 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 D s t index. • A test particle simulation code was developed to estimate the proton flux inside the SAA, given several background time-fixed magnetic field configurations computed by Tsyganenko models. • The current numerical model could successfully reveal the SAA basic features similarly observed by recent works. • The proton flux intensity in the SAA was significantly increased for small geodipole tilting angle (during equinox) in comparison with large tilting angles. • When implementing time-fixed magnetic field configuration, we found that the proton flux in the SAA was larger during the active times ( D s t = -210 nT) than during the quiet times ( D s t = -7 nT)." @default.
- W4226159027 created "2022-05-05" @default.
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- W4226159027 date "2021-12-01" @default.
- W4226159027 modified "2023-10-17" @default.
- W4226159027 title "Seasonal variation and geomagnetic storm index effects on the proton flux response in the South Atlantic Anomaly by test particle simulations" @default.
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- W4226159027 doi "https://doi.org/10.1016/j.jastp.2021.105808" @default.
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