Seasonal Variation and Geomagnetic Storm Index Effects on the Proton Flux Response in the South Atlantic Anomaly by Test Particle Simulations

Posted: 8 Dec 2021

See all articles by Kirolosse Girgis

Kirolosse Girgis

Kyushu University

Tohru Hada

Kyushu University

Shuichi Matsukiyo

Kyushu University

Abstract

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.

Keywords: South Atlantic Anomaly, Test Particle Simulations, Geodipole Tilting Angle, Dst Index

Suggested Citation

Girgis, Kirolosse and Hada, Tohru and Matsukiyo, Shuichi, Seasonal Variation and Geomagnetic Storm Index Effects on the Proton Flux Response in the South Atlantic Anomaly by Test Particle Simulations. Available at SSRN: https://ssrn.com/abstract=3980599

Kirolosse Girgis (Contact Author)

Kyushu University ( email )

Kasuga, Fukuoka, Japan
Fukuoka, 816-8580
Japan

Tohru Hada

Kyushu University ( email )

6-19-1, Hakozaki, Higashiku
Fukuoka, Fukuoka 812-8581
Japan

Shuichi Matsukiyo

Kyushu University ( email )

6-19-1, Hakozaki, Higashiku
Fukuoka, Fukuoka 812-8581
Japan

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