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arXiv 0901.2817astro-ph.SR
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更多关于冠状面变暗的难以忽视的事实

More of the Inconvenient Truth About Coronal Dimmings

Scott W. McIntosh, Joan Burkepile, Robert J. Leamon

摘要:

我们继续调查的日冕物质抛射驱动的日冕变暗从2006年12月14日使用独特的高分辨率成像的色球层和日冕从日出航天器。在变暗事件的过程中,我们观察到多条发射线的非热谱线增宽的动态增加,因为CME被释放,日冕打开;达到日冕洞中看到的水平。当日冕开始关闭、重新填充和变亮时,我们看到非热增宽朝着喷发前的水平减少。非热加宽的动态演化与磁开放稀薄调光区中阿尔芬波振幅的预期变化相一致,与CME之前的致密闭合日冕相比。所提供的数据加强了这样一种信念,即日冕变暗必须是快速太阳风的临时来源。目前还不清楚日冕热力学向太阳风状态的快速转变是否对日冕物质抛射本身有影响。

英文摘要:

We continue the investigation of a CME-driven coronal dimming from December 14 2006 using unique high resolution imaging of the chromosphere and corona from the Hinode spacecraft. Over the course of the dimming event we observe the dynamic increase of non-thermal line broadening of multiple emission lines as the CME is released and the corona opens; reaching levels seen in coronal holes. As the corona begins to close, refill and brighten, we see a reduction of the non-thermal broadening towards the pre-eruption level. The dynamic evolution of non-thermal broadening is consistent with the expected change of Alfven wave amplitudes in the magnetically open rarefied dimming region, compared to the dense closed corona prior to the CME. The presented data reinforce the belief that coronal dimmings must be temporary sources of the fast solar wind. It is unclear if such a rapid transition in the thermodynamics of the corona to a solar wind state has an effect on the CME itself.

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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