通过XMM-牛顿探测的太阳风电荷交换发射看到的高电荷态日冕物质抛射
A high charge state Coronal Mass Ejection seen through solar wind charge exchange emission as detected by XMM-Newton
摘要：
我们提出了一个观察XMM-牛顿，表现出强烈的可变，低能量的扩散X射线线发射的分析。我们的理由是，这种排放是由于本地化的太阳风电荷交换（SWCX），起源于一个通过云的等离子体与日冕物质抛射（CME）相互作用的中性在地球的外逸层。与以前的地冠SWCX或行星际空间的例子相比，SWCX的这种情况表现出更丰富的发射线光谱。我们表明，从OVIII发射是非常突出的SWCX光谱。观察到的通量从氧离子的18.9千电子伏cm-2 s-1 Sr-1是一致的SWCX从一个通过CME。在光谱中也观察到高度电离的硅，并且高电荷铁的存在是我们观察到CME发射的另一个光谱指标。我们认为，这是相同的事件检测到的太阳风监测ACE和风测量强烈增加的太阳风通量由于CME已被释放的太阳前两天的XMM-牛顿观测。
英文摘要：
We present the analysis of an observation by XMM-Newton that exhibits strongly variable, low-energy diffuse X-ray line emission. We reason that this emission is due to localised solar wind charge exchange (SWCX), originating from a passing cloud of plasma associated with a Coronal Mass Ejection (CME) interacting with neutrals in the Earth's exosphere. This case of SWCX exhibits a much richer emission line spectrum in comparison with previous examples of geocoronal SWCX or in interplanetary space. We show that emission from OVIII is very prominent in the SWCX spectrum. The observed flux from oxygen ions of 18.9 keV cm-2 s-1 sr-1 is consistent with SWCX resulting from a passing CME. Highly ionised silicon is also observed in the spectrum, and the presence of highly charged iron is an additional spectral indicator that we are observing emission from a CME. We argue that this is the same event detected by the solar wind monitors ACE and Wind which measured an intense increase in the solar wind flux due to a CME that had been released from the Sun two days previous to the XMM-Newton observation.
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