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Three-Dimensional Simulations of Solar Wind Preconditioning and the 23 July 2012 Interplanetary Coronal Mass Ejection
Solar Physics ( IF 2.7 ) Pub Date : 2020-09-01 , DOI: 10.1007/s11207-020-01700-5
Ravindra T. Desai , Han Zhang , Emma E. Davies , Julia E. Stawarz , Joan Mico-Gomez , Pilar Iváñez-Ballesteros

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 travelled 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.

中文翻译:

太阳风预处理和 2012 年 7 月 23 日行星际日冕物质抛射的三维模拟

预测日冕的大规模爆发及其在行星际空间的传播仍然是太阳和太阳物理学研究中的一个突出挑战。在本文中,我们描述了内部日光层的三维磁流体动力学模拟,该模拟导致并包括 2012 年 7 月 23 日的极端行星际日冕物质抛射 (ICME),该模拟是使用代码 PLUTO 开发的。模拟是使用卡林顿自转 2125 和 2126 日冕模型的输出驱动的,鉴于初始条件的不确定性,能够重现与 7 月 23 日 ICME 相当的事件,在 1 au 具有相似的速度和密度剖面. 然后,该事件的发射时间根据最初的 7 月 19 日 ICME 发生变化,并且发现太阳风预处理的影响对于这种规模的事件是显着的,并且在与弹道再填充一致的时间窗口内减少枯竭的日光层部门。这些结果表明,7 月 23 日的 ICME 几乎不受之前事件的影响,但如果它在时间上更接近 7 月 19 日的事件,它会经历更低的阻力,它的传播速度会更快。我们在空间天气预报的背景下讨论了这种对太阳风预处理的系统研究。这些结果表明,7 月 23 日的 ICME 几乎不受之前事件的影响,但如果它在时间上更接近 7 月 19 日的事件,它会经历更低的阻力,它的传播速度会更快。我们在空间天气预报的背景下讨论了这种对太阳风预处理的系统研究。这些结果表明,7 月 23 日的 ICME 几乎不受之前事件的影响,但如果它在时间上更接近 7 月 19 日的事件,它会经历更低的阻力,它的传播速度会更快。我们在空间天气预报的背景下讨论了这种对太阳风预处理的系统研究。
更新日期:2020-09-01
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