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arXiv 2008.08816astro-ph.SRphysics.space-ph
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太阳行星际CME的高氦丰度和电荷态及其物质来源

The high helium abundance and charge states of the interplanetary CME and its material source on the Sun

Hui Fu, R. A. Harrison, J. A. Davies, LiDong Xia, XiaoShuai Zhu, Bo Li, ZhengHua Huang, D. Barnes

摘要:

确定日冕物质抛射(CME)中物质的来源和理解CME的发生机制是太阳和空间物理学中的基本问题。与等离子体成分有关的参数,例如电荷状态和He丰度(\ahe),对于源自太阳上不同过程或区域的等离子体可能不同。因此,研究CME成分的现场测量与太阳活动之间的关系至关重要。我们研究了2014年9月10日爆发的CME,与X1.6耀斑相关,通过分析AIA成像和IRIS光谱观测及其由Wind和ACE检测到的原位特征。我们发现,在缓慢膨胀和强度增加的S形,等离子体温度为9 MK,更高,首先出现在S形的脚点,与色球增亮。然后高温区沿乙状结肠延伸。IRIS观测证实了这种延伸是由热等离子体上升流的输送引起的。我们的研究结果表明,色球物质可以加热到9 MK,以上,色球蒸发在S形脚点耀斑爆发前。被加热的色球物质可以输运到S形结构中,并为CME提供质量。上述CME大量供应情景为在相关ICME中检测到高电荷状态和升高的\ahe \提供了合理的解释。观测结果还表明,准稳态演化的先驱相是由磁重联之间的上升磁通绳和上覆的磁场结构。

英文摘要:

Identifying the source of the material within coronal mass ejections (CMEs) and understanding CME onset mechanisms are fundamental issues in solar and space physics. Parameters relating to plasma composition, such as charge states and He abundance (\ahe), may be different for plasmas originating from differing processes or regions on the Sun. Thus, it is crucial to examine the relationship between in-situ measurements of CME composition and activity on the Sun. We study the CME that erupted on 2014 September 10, in association with an X1.6 flare, by analyzing AIA imaging and IRIS spectroscopic observations and its in-situ signatures detected by Wind and ACE. We find that during the slow expansion and intensity increase of the sigmoid, plasma temperatures of 9 MK, and higher, first appear at the footpoints of the sigmoid, associated with chromospheric brightening. Then the high-temperature region extends along the sigmoid. IRIS observations confirm that this extension is caused by transportation of hot plasma upflow. Our results show that chromospheric material can be heated to 9 MK, and above, by chromospheric evaporation at the sigmoid footpoints before flare onset. The heated chromospheric material can transport into the sigmoidal structure and supply mass to the CME. The aforementioned CME mass supply scenario provides a reasonable explanation for the detection of high charge states and elevated \ahe\ in the associated ICME. The observations also demonstrate that the quasi-steady evolution in the precursor phase is dominated by magnetic reconnection between the rising flux rope and the overlying magnetic field structure.

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