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arXiv 1803.04769astro-ph.SR
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地行日冕物质抛射的日冕磁结构及原位比较

Coronal Magnetic Structure of Earthbound CMEs and In situ Comparison

Erika Palmerio, Emilia K. J. Kilpua, Christian Möstl, Volker Bothmer, Alexander W. James, Lucie M. Green, Alexey Isavnin, Jackie A. Davies, Richard A. Harrison

摘要:

在日冕物质抛射(CME)到达地球之前预测其内部的磁场是空间天气研究中的重要问题之一。在这篇文章中,我们比较了内在的磁通绳类型,即CME的方向和旋向在喷发过程中,与现场磁通绳类型的20 CME事件,已唯一地从太阳到地球,通过日光层成像。我们的研究表明,内禀磁通绳类型可以估计CME起源于不同的源区使用的间接代理的组合。我们发现,只有20%的事件研究严格匹配的内在和原位磁通绳类型之间。当中间情况(在太阳和/或原位的方向接近45°)被认为是匹配时,百分比上升到55%。我们还确定了太阳和地球之间的磁通绳倾斜角的变化。对于大多数情况,旋转是几十度,而35%的事件变化超过90°。虽然偶尔的内禀磁通绳型是一个很好的代理影响地球的磁结构,我们的研究强调了捕捉的空间天气预报目的的CME演变的重要性。此外,我们强调,确定的内禀磁绳类型是一个重要的输入CME预测模型。

英文摘要:

Predicting the magnetic field within an Earth-directed coronal mass ejection (CME) well before its arrival at Earth is one of the most important issues in space weather research. In this article, we compare the intrinsic flux rope type, i.e. the CME orientation and handedness during eruption, with the in situ flux rope type for 20 CME events that have been uniquely linked from Sun to Earth through heliospheric imaging. Our study shows that the intrinsic flux rope type can be estimated for CMEs originating from different source regions using a combination of indirect proxies. We find that only 20% of the events studied match strictly between the intrinsic and in situ flux rope types. The percentage rises to 55% when intermediate cases (where the orientation at the Sun and/or in situ is close to 45°) are considered as a match. We also determine the change in the flux rope tilt angle between the Sun and Earth. For the majority of the cases, the rotation is several tens of degrees, whilst 35% of the events change by more than 90°. While occasionally the intrinsic flux rope type is a good proxy for the magnetic structure impacting Earth, our study highlights the importance of capturing the CME evolution for space weather forecasting purposes. Moreover, we emphasize that determination of the intrinsic flux rope type is a crucial input for CME forecasting models.

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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