Suzaku detection of solar wind charge exchange emission from a variety of highly ionized ions in an interplanetary coronal mass ejection
Suzaku detection of solar wind charge exchange emission from a variety of highly ionized ions in an interplanetary coronal mass ejection
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DOI：
10.1093/pasj/psab015
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发表时间：
2021-02
影响因子：
2.3
通讯作者：
K. Asakura;H. Matsumoto;K. Okazaki;T. Yoneyama;H. Noda;K. Hayashida;H. Tsunemi;H. Nakajima;S. Katsuda;Daiki Ishi;Y. Ezoe
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文献类型：
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作者：
K. Asakura;H. Matsumoto;K. Okazaki;T. Yoneyama;H. Noda;K. Hayashida;H. Tsunemi;H. Nakajima;S. Katsuda;Daiki Ishi;Y. Ezoe
通过太阳风电荷交换（SWCX）产生的X射线辐射已知会污染X射线观测数据，其数量通常很大，甚至占主导地位，特别是在软X射线波段，当主要目标由相对较弱的漫射源组成时，这取决于观测期间的空间天气。特别是，行星际日冕物质抛射（ICME）引起的SWCX事件往往光谱丰富，并提供有关ICME等离子体中金属丰度的关键信息。我们分析了2005年9月11日在X6级太阳耀斑后不久用朱雀观测到的SN 1006背景数据，这些耀斑的特征分别与相关的ICME一起被检测到。我们发现，这些数据包括从各种高度电离的离子通过SWCX产生的发射线。发现检测到的离子的相对丰度与过去ICME驱动的SWCX事件一致。因此，我们得出结论，该事件是ICME驱动的。此外，我们首次从SWCX发射中检测到硫xvi线，这表明它是有史以来观测到的光谱最丰富的SWCX事件。我们认为，ICME驱动的SWCX事件的观测可以提供一个独特的探针，研究人口的高度电离的离子在等离子体中，这是很难测量在目前可用的原位观测。
X-ray emission generated through solar-wind charge exchange (SWCX) is known to contaminate X-ray observation data, the amount of which is often significant or even dominant, particularly in the soft X-ray band, when the main target consists of comparatively weak diffuse sources, depending on the space weather during the observation. In particular, SWCX events caused by interplanetary coronal mass ejections (ICMEs) tend to be spectrally rich and to provide critical information about the metal abundance in the ICME plasma. We analyzed the SN1006 background data observed with Suzaku on 2005 September 11 shortly after an X6-class solar flare, signatures of which were separately detected together with an associated ICME. We found that the data include emission lines from a variety of highly ionized ions generated through SWCX. The relative abundances of the detected ions were found to be consistent with those in past ICME-driven SWCX events. Thus, we conclude that this event was ICME driven. In addition, we detected a sulfur xvi line for the first time as one from an SWCX emission, which suggests that it is the most spectrally rich SWCX event ever observed. We suggest that observations of ICME-driven SWCX events can provide a unique probe to study the population of highly ionized ions in the plasma, which is difficult to measure in currently available in situ observations.