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arXiv 0902.2004physics.space-ph
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STEREO时代的日地模拟:2007年1月24-25日的爆发

Solar-Terrestrial Simulation in the STEREO Era: The January 24-25, 2007 Eruptions

N. Lugaz, A. Vourlidas, I. I. Roussev, H. Morgan

摘要:

最近发射的STEREO航天器上的SECCHI仪器首次能够连续跟踪从太阳到1个天文单位的日冕物质抛射。我们分析了2007年1月24日至25日CME的视线观测,并通过使用三维磁流体动力学(MHD)代码(空间天气建模框架(SWMF))进行数值模拟,填补了1月25日SECCHI覆盖范围内的20小时空白。我们展示了观测结果如何反映两个连续的日冕物质抛射相互之间以及与结构化太阳风的相互作用。我们从我们的模型,包括几个位置角的时间延长地图的观测和合成图像之间进行了详细的比较。通过数值模拟将观测结果与物理效应分开,我们能够研究喷射的三维性质及其在日光层内部的演变。这项研究反映了一个新时代的开始,一方面,CME传播和相互作用的模型可以通过使用日光层观测进行充分测试,另一方面,观测可以通过使用全球数值模型进行更好的解释。

英文摘要:

The SECCHI instruments aboard the recently launched STEREO spacecraft enable for the first time the continuous tracking of coronal mass ejections (CMEs) from the Sun to 1 AU. We analyze line-of-sight observations of the January 24-25, 2007 CMEs and fill the 20-hour gap in SECCHI coverage in January 25 by performing a numerical simulation using a three-dimensional magneto-hydrodynamic (MHD) code, the Space Weather Modeling Framework (SWMF). We show how the observations reflect the interaction of the two successive CMEs with each other and with the structured solar wind. We make detailed comparison between the observations and synthetic images from our model, including time-elongation maps for several position angles. Having numerical simulations to disentangle observational from physical effects, we are able to study the three-dimensional nature of the ejections and their evolution in the inner heliosphere. This study reflects the start of a new era where, on one hand, models of CME propagation and interaction can be fully tested by using heliospheric observations and, on the other hand, observations can be better interpreted by using global numerical models.

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