Numerical Simulations of the Geospace Response to the Arrival of an Idealized Perfect Interplanetary Coronal Mass Ejection
Numerical Simulations of the Geospace Response to the Arrival of an Idealized Perfect Interplanetary Coronal Mass Ejection
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DOI：
10.1029/2020sw002489
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发表时间：
2020-12
期刊：
影响因子：
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通讯作者：
Daniel T. Welling;Jeffrey J. Love;E. Rigler;D. M. Oliveira;Colin M. Komar;Steven K. Morley
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文献类型：
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作者：
Daniel T. Welling;Jeffrey J. Love;E. Rigler;D. M. Oliveira;Colin M. Komar;Steven K. Morley
此前，鹤谷和Lakhina（2014，https：//doi.org/10.1002/2013GL058825）创建了一个“完美”行星际日冕物质抛射的估计，并对地球空间的响应进行了简单的计算，包括dB/dt。在这项研究中，这些估计用于驱动地球空间的耦合磁流体动力学-环电流-电离层模型，以获得对此类事件的地球空间响应的更准确的物理估计。检查突然脉冲相位并将其与鹤谷和Lakhina的估计进行比较（2014，https：//doi.org/10.1002/2013GL058825）。基于物理的模拟产生了与先前研究类似的Dst上升，磁层顶压缩和赤道dB/dt值的估计。然而，结果偏离赤道。dB/dt值超过30 nT/s的发现低至40°磁纬度。在向南行星际磁场条件下，磁层顶侵蚀与强的第一区Birkeland电流相结合，以加强dB/dt响应。这里获得的值超过了历史记录的事件中发现的值，并设置了地球极端地磁感应电流活动的上限。
Previously, Tsurutani and Lakhina (2014, https://doi.org/10.1002/2013GL058825) created estimates for a “perfect” interplanetary coronal mass ejection and performed simple calculations for the response of geospace, including dB/dt . In this study, these estimates are used to drive a coupled magnetohydrodynamic‐ring current‐ionosphere model of geospace to obtain more physically accurate estimates of the geospace response to such an event. The sudden impulse phase is examined and compared to the estimations of Tsurutani and Lakhina (2014, https://doi.org/10.1002/2013GL058825). The physics‐based simulation yields similar estimates for Dst rise, magnetopause compression, and equatorial dB/dt values as the previous study. However, results diverge away from the equator. dB/dt values in excess of 30 nT/s are found as low as 40° magnetic latitude. Under southward interplanetary magnetic field conditions, magnetopause erosion combines with strong region one Birkeland currents to intensify the dB/dt response. Values obtained here surpass those found in historically recorded events and set the upper threshold of extreme geomagnetically induced current activity at Earth.