Three-Dimensional Simulations of Solar Wind Preconditioning and the 23 July 2012 Interplanetary Coronal Mass Ejection
Three-Dimensional Simulations of Solar Wind Preconditioning and the 23 July 2012 Interplanetary Coronal Mass Ejection
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DOI：
10.1007/s11207-020-01700-5
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发表时间：
2020-09
期刊：
影响因子：
2.8
通讯作者：
R. Desai;Hang Zhang;E. Davies;J. Stawarz;Joan Mico-Gomez;Pilar Iváñez-Ballesteros
中科院分区：
文献类型：
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作者：
R. Desai;Hang Zhang;E. Davies;J. Stawarz;Joan Mico-Gomez;Pilar Iváñez-Ballesteros
预测太阳日冕的大规模喷发及其在星际空间的传播仍然是太阳和太阳物理研究中的一个突出挑战。在这篇文章中，我们描述了内部日光层的三维磁流体动力学模拟，包括2012年7月23日的极端行星际日冕物质抛射(ICME)，这是使用Pluto程序开发的。这些模拟是使用卡林顿自转2125和2126的日冕模型的输出来驱动的，在初始条件存在不确定性的情况下，能够重现与7月23日ICME相当的事件，在1au具有类似的速度和密度分布。随后，该事件的发射时间相对于最初的7月19日ICME有所不同，发现太阳风预适应对这种规模的事件的影响很大，并且随着日球层枯竭扇区的弹道再充填，其影响在时间窗内减小。这些结果表明，7月23日的ICME基本上不受先前事件的影响，但如果它在距离7月19日事件更近的时间喷发，它的移动速度会更快，因为在7月19日的事件中，它会经历更小的阻力。我们在空间天气预报的背景下讨论了太阳风预适应的这一系统研究。
Predicting the large-scale eruptions from the solar corona and their propagation through interplanetary space remains an outstanding challenge in solar- and helio-physics research. In this article, we describe three-dimensional magnetohydrodynamic simulations of the inner heliosphere leading up to and including the extreme interplanetary coronal mass ejection (ICME) of 23 July 2012, developed using the code PLUTO. The simulations are driven using the output of coronal models for Carrington rotations 2125 and 2126 and, given the uncertainties in the initial conditions, are able to reproduce an event of comparable magnitude to the 23 July ICME, with similar velocity and density profiles at 1 au. The launch time of this event is then varied with regards to an initial 19 July ICME and the effects of solar wind preconditioning are found to be significant for an event of this magnitude and to decrease over a time-window consistent with the ballistic refilling of the depleted heliospheric sector. These results indicate that the 23 July ICME was mostly unaffected by events prior, but would have traveled even faster had it erupted closer in time to the 19 July event where it would have experienced even lower drag forces. We discuss this systematic study of solar wind preconditioning in the context of space weather forecasting.