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Relating 27-Day Averages of Solar, Interplanetary Medium Parameters, and Geomagnetic Activity Proxies in Solar Cycle 24
Solar Physics ( IF 2.7 ) Pub Date : 2021-07-27 , DOI: 10.1007/s11207-021-01856-8
Yvelice Castillo 1, 2, 3 , Maria Alexandra Pais 2, 3 , João Fernandes 2, 4 , Paulo Ribeiro 2 , Anna L. Morozova 2 , Fernando J. G. Pinheiro 2
Affiliation  

Correlations between solar, interplanetary-medium parameters, and geomagnetic-activity proxies in 27-day averages (a Bartels rotation) were analyzed for the 2009 – 2016 time interval. In this analysis, two new proxies were considered: i) \(B_{zs}\) GSM (Geocentric Solar Magnetic), calculated as the daily percentage of the IMF southward component along the GSM \(z\)-axis and then averaged every 27 days; ii) four magnetospheric indices (T-indices), calculated from the local north–south (\(x\)) contributions of the magnetosphere’s cross-tail (TAIL), the symmetric ring current (SRC), the partial ring current (PRC), and the Birkeland current (FAC), derived from the Tsyganenko and Sitnov (J. Geophys. Res. 110, A03208, 2005: TS05) semi-empirical magnetospheric model. Our results suggest that, among the parameters tested in this study, solar facular areas, interplanetary magnetic-field intensity and new proxies derived from the TS05 model could be taken into account in an empirical model, with a 27-day resolution, to explain geomagnetic activity felt on the Earth’s surface in terms of solar-surface features and the IMF condition. We further retrieve a clear annual oscillation in series of 27-day-mean values of toward/away asymmetries of geomagnetic-activity indices, which can be interpreted in the light of the Russell–McPherron hypothesis for the semiannual variation of geomagnetic activity.



中文翻译:

将太阳、行星际介质参数和太阳周期中地磁活动代理的 27 天平均值相关联 24

分析了 2009 年至 2016 年时间间隔的 27 天平均值(巴特尔旋转)中太阳、行星际介质参数和地磁活动代理之间的相关性。在此分析中,考虑了两个新代理:i)  \(B_{zs}\) GSM(地心太阳磁),计算为沿 GSM \(z\)轴的 IMF 南向分量的每日百分比,然后取平均值每 27 天;ii) 四个磁层指数 (T-indices),由磁层横尾 (TAIL)、对称环电流 (SRC)、部分环电流 (PRC) 的局部南北 ( \(x\) ) 贡献计算),以及源自 Tsyganenko 和 Sitnov ( J. Geophys. Res. 110, A03208, 2005: TS05) 半经验磁层模型。我们的结果表明,在本研究测试的参数中,太阳光斑面积、行星际磁场强度和源自 TS05 模型的新代理可以在具有 27 天分辨率的经验模型中考虑,以解释地磁根据太阳表面特征和 IMF 条件在地球表面感受到的活动。我们进一步检索了地磁活动指数走向/远离不对称性的一系列 27 天平均值的明显年度振荡,这可以根据关于地磁活动半年变化的 Russell-McPherron 假设进行解释。

更新日期:2021-07-27
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