文章基本信息

标题：Unusually low density regions in the compressed slow wind: Solar wind transients of small coronal hole origin
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作者：Yong C.-M. Liu ; Zhaohui Qi ; Jia Huang 等
期刊名称：Astronomy & Astrophysics
印刷版ISSN：0004-6361
电子版ISSN：1432-0746
出版年度：2020
卷号：635
页码：1-14
DOI：10.1051/0004-6361/201935884
语种：English
出版社：EDP Sciences
摘要：We report on two small solar wind transients embedded in the corotating interaction region, characterized by surprisingly lower proton density compared with their surrounding regions. In addition to lower density, these two small solar wind transients showed other interesting features like higher proton temperature, higher alpha-proton ratios, and lower charge states (C+6/C+5and O+7/O+6). A synthesized picture for event One combining the observations by STEREO B, ACE, and Wind showed that this small solar transient has an independent magnetic field. Back-mapping links the origin of the small solar transient to a small coronal hole on the surface of the Sun. Considering these special features and the back-mapping, we conclude that such small solar wind transients may have originated from a small coronal hole at low latitudes.
关键词：enSun: heliospheresolar windmagnetic reconnectionSun: oscillations