Relation of Coronal Rain Originating from Coronal Condensations to Interchange Magnetic Reconnection
Relation of Coronal Rain Originating from Coronal Condensations to Interchange Magnetic Reconnection
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日冕凝聚产生的日冕雨与交换磁重联的关系
DOI：
10.3847/1538-4357/abc68c
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发表时间：
2020-11
期刊：
影响因子：
--
通讯作者：
Song H. Q.
中科院分区：
文献类型：
--
作者：
Li L. P.;Peter H.;Lakshmi Pradeep Chitta;Song H. Q.
利用极紫外图像，我们最近提出了一种新的、可替代的日冕雨形成机制，该机制是由于交换磁重联而沿着磁场开放线形成的。本文报道了在色球温度和过渡区温度下的日冕雨，它是由日冕环之间的重连引起的日冕凝聚引起的。为此，我们使用了太阳动力学观测台的界面区域成像光谱仪（IRIS）和大气成像组件（AIA）。2013年10月19日左右，IRIS在太阳东南方边缘的弯曲路径上记录了一场日冕雨。与此相关的是，我们发现在AIA图像中反复出现的地势较高的开放特征和地势较低的闭环系统之间的重新连接。在这个过程中，地势较高的地物形成磁倾角。作为响应，出现两组新重新连接的环路，并从重新连接区域撤回。从10月18日到20日，由于热不稳定，日冕等离子体的冷却和凝结在几天内反复发生了7次。凝结物以日冕雨的形式向下流动到地表，凝结物之间的平均间隔为~ 6.6小时。在IRIS数据可用的情况下，我们发现冷凝一直冷却到色球温度。根据我们的观测，我们认为在色球温度下观测到的一些日冕雨事件可以用新的和替代的日冕雨形成情景来解释，在这种情景中，交换重连接促进了凝结。
Using extreme-ultraviolet images, we recently proposed a new and alternative formation mechanism for coronal rain along magnetically open field lines due to interchange magnetic reconnection. In this paper we report coronal rain at chromospheric and transition region temperatures originating from the coronal condensations facilitated by reconnection between open and closed coronal loops. For this, we employ the Interface Region Imaging Spectrograph (IRIS) and the Atmospheric Imaging Assembly (AIA) of the Solar Dynamics Observatory. Around 2013 October 19, a coronal rain along curved paths was recorded by IRIS over the southeastern solar limb. Related to this, we found reconnection between a system of higher-lying open features and lower-lying closed loops that occurs repeatedly in AIA images. In this process, the higher-lying features form magnetic dips. In response, two sets of newly reconnected loops appear and retract away from the reconnection region. In the dips, seven events of cooling and condensation of coronal plasma repeatedly occur due to thermal instability over several days, from October 18 to 20. The condensations flow downward to the surface as coronal rain, with a mean interval between condensations of ∼6.6 hr. In the cases where IRIS data were available we found the condensations to cool all the way down to chromospheric temperatures. Based on our observations we suggest that some of the coronal rain events observed at chromospheric temperatures could be explained by the new and alternative scenario for the formation of coronal rain, where the condensation is facilitated by interchange reconnection.
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DOI：
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发表时间：
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期刊：
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影响因子：
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作者：
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