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arXiv 0908.1913astro-ph.SR
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用STEREO/EUVI观察到的CME膨胀和EUV变暗的4D建模

4D Modeling of CME expansion and EUV dimming observed with STEREO/EUVI

Markus J. Aschwanden

摘要:

这是第一次尝试模拟CME发射的运动学和由此产生的EUV调光定量与自洽模型。我们的4D模型假设自相似膨胀的球形CME几何形状,包括一个CME前密度压缩和一个腔密度稀疏,满足质量守恒的总CME和扫电晕。该模型包含14个自由参数,并拟合了2008年3月25日STEREO/A和B观测到的CME事件。我们的模型能够再现从18:30 UT到19:00 UT的初始阶段期间观察到的CME膨胀和相关的EUV调光。CME运动学可以由恒定加速度(即,恒定的磁驱动力)。虽然EUVI/A的观测结果与球形气泡几何形状一致,但我们发现EUVI/B存在显著的不对称性和密度不均匀性。这种新的正演模拟方法演示了如何观察到的EUV调光可以用来模拟CME源区的物理参数,CME几何形状和CME运动学。

英文摘要:

This is the first attempt to model the kinematics of a CME launch and the resulting EUV dimming quantitatively with a self-consistent model. Our 4D-model assumes self-similar expansion of a spherical CME geometry that consists of a CME front with density compression and a cavity with density rarefaction, satisfying mass conservation of the total CME and swept-up corona. The model contains 14 free parameters and is fitted to the 2008 March 25 CME event observed with STEREO/A and B. Our model is able to reproduce the observed CME expansion and related EUV dimming during the initial phase from 18:30 UT to 19:00 UT. The CME kinematics can be characterized by a constant acceleration (i.e., a constant magnetic driving force). While the observations of EUVI/A are consistent with a spherical bubble geometry, we detect significant asymmetries and density inhomogeneities with EUVI/B. This new forward-modeling method demonstrates how the observed EUV dimming can be used to model physical parameters of the CME source region, the CME geometry, and CME kinematics.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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