A Comparative Study on Electron Contribution to the Ring Current During CME and CIR Driven Geomagnetic Storms Using RAM-SCB Simulations and Arase and Ground Magnetic Data

Sandeep Kumar,Yoshizumi Miyoshi,Vania Koleva Jordanova,Miles Engel,Kazushi Asamura,Shoichiro Yokota,Satoshi Kasahara,Yoichi Kazama,Shiang-Yu Wang,Takefumi Mitani,Kunihiro Keika,Tomoaki Hori,Chae-Woo Jun,Iku Shinohara

crossref（2022）

Cited 0|Views36

Abstract

Geomagnetic storms are the main component of space weather and are driven by coronal mass ejections (CMEs) or corotating interaction regions (CIRs). During the main phase of geomagnetic storms, the ring current enhances and a global decrease in the H component of the geomagnetic field is observed. The storm time distribution of ring current ions and electrons in the inner magnetosphere depend strongly on their transport in evolutions of electric and magnetic fields along with acceleration and loss. Recently, we showed that the electron pressure contributes to the depression of ground magnetic field during the storm time by comparing Ring current Atmosphere interactions Model with Self Consistent magnetic field (RAM-SCB) simulation, Arase in-situ plasma/particle data, and ground-based magnetometer data [Kumar et al., 2021]. In this study, we compare the contribution of electron pressure to the ring current during selected CIR and CME geomagnetic storms using ground observations and the self-consistent inner magnetosphere model: RAM-SCB. The previous results show that the ions are the major contributor (~ 90 %) to the total ring current and the electron contributes ~10 % to the ring current pressure in the post-midnight to dawn sector where electrons flux is higher compared to ions flux. As CIR and CME storms have different origins, we will discuss expected differences in the contribution of electron pressure to the ring current.

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Geomagnetic Storms

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【要点】：本文通过RAM-SCB模拟及Arase卫星与地面磁力数据比较分析，研究了在CME和CIR驱动的地磁暴期间，电子对环电流的贡献及其对地面磁场的影响。

【方法】：采用RAM-SCB模型模拟地磁暴期间环电流的动态变化，并结合Arase卫星在轨测得的等离子体/粒子数据以及地面磁力数据进行分析。

【实验】：选取特定CIR和CME地磁暴事件，对比分析了电子压力对环电流的贡献，实验数据来源于RAM-SCB模拟结果及实际观测数据，结果显示在午夜至拂晓时段，电子对环电流压力的贡献约为10%。