Volume 635, March 2020
|Number of page(s)||14|
|Section||The Sun and the Heliosphere|
|Published online||05 March 2020|
Unusually low density regions in the compressed slow wind: Solar wind transients of small coronal hole origin
State Key Laboratory of Space Weather, National Space Science Center, Chinese Academy of Sciences, Beijing, PR China
2 College of Earth Sciences, University of Chinese Academy of Sciences, Beijing, PR China
3 Climate and Space Sciences and Engineering, University of Michigan, Ann Arbor, MI 48109, USA
4 Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Institute of Space Sciences, Shandong University, Weihai 264209, Shandong, PR China
5 Max-Planck-Institut für extraterrestrische Physik, Garching, Germany
6 School of Earth and Space Sciences, Peking University, 100871 Beijing, PR China
7 Institute for the Study of Earth, Oceans and Space, University of New Hampshire, Durham, New Hampshire, USA
Accepted: 2 January 2020
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+5 and 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.
Key words: Sun: heliosphere / solar wind / magnetic reconnection / Sun: oscillations
© ESO 2020
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.