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Solar wind parameter and seasonal variation effects on the South Atlantic Anomaly using Tsyganenko Models
Earth, Planets and Space ( IF 3.362 ) Pub Date : 2020-07-13 , DOI: 10.1186/s40623-020-01221-2
Kirolosse M. Girgis , Tohru Hada , Shuichi Matsukiyo

We studied the space weather effects on the South Atlantic Anomaly (SAA) magnetic response using Tsyganenko models. For the physical parameters characterizing the SAA, the study considered the minimum magnetic field, the location (longitude and latitude) of the SAA center, and the area of the SAA. Regarding the space weather parameters, we considered the solar wind dynamic pressure, the interplanetary magnetic field components, $$B_{yIMF}$$ B yIMF and $$B_{zIMF}$$ B zIMF , the Dst index, and the geodipole tilting angle. To study the magnetic field response of the SAA, several different versions of the Tsyganenko models, namely, T96, T01, and TS05, were used to describe the external magnetic field contributions. The main internal magnetic field was calculated by the International Geomagnetic Reference Field (IGRF-12). The magnetic field study of the SAA was realized in long- and short-term (seasonal and diurnal) variations. We found that the Dst index and the geodipole tilting angle were the strongest influencing parameters on the SAA magnetic field response at all altitudes. Moreover, it was revealed that both magnetic poles might be a possible cause of the SAA magnetic field response, resulting from the space weather conditions. Furthermore, the magnetic field behavior of the SAA was affected by hourly variations, where the largest changes occurred at dayside.

中文翻译:

使用 Tsyganenko 模型的太阳风参数和季节变化对南大西洋异常的影响

我们使用 Tsyganenko 模型研究了空间天气对南大西洋异常 (SAA) 磁响应的影响。对于表征 SAA 的物理参数,研究考虑了最小磁场、SAA 中心的位置(经度和纬度)以及 SAA 的面积。关于空间天气参数,我们考虑了太阳风动压、行星际磁场分量、$$B_{yIMF}$$ B yIMF 和 $$B_{zIMF}$$ B zIMF 、Dst 指数和地偶极倾斜角度。为了研究 SAA 的磁场响应,使用了 Tsyganenko 模型的几个不同版本,即 T96、T01 和 TS05,来描述外部磁场的贡献。主要内部磁场由国际地磁参考场(IGRF-12)计算。SAA 的磁场研究是在长期和短期(季节性和昼夜)变化中实现的。我们发现 Dst 指数和地偶极倾斜角是所有高度下对 SAA 磁场响应影响最大的参数。此外,发现两个磁极可能是 SAA 磁场响应的可能原因,这是由空间天气条件引起的。此外,SAA 的磁场行为受每小时变化的影响,其中最大的变化发生在白天。结果表明,由于空间天气条件,两个磁极都可能是 SAA 磁场响应的可能原因。此外,SAA 的磁场行为受每小时变化的影响,其中最大的变化发生在白天。结果表明,由于空间天气条件,两个磁极都可能是 SAA 磁场响应的可能原因。此外,SAA 的磁场行为受每小时变化的影响,其中最大的变化发生在白天。
更新日期:2020-07-13
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