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- Title
Statistical Study of Ion Upflow Associated with Subauroral Polarization Streams (SAPS) at Substorm Time.
- Authors
Zhang, Qiang; Liu, Yong C.‐M.; Zhang, Q.‐H.; Xing, Zan‐Yang; Wang, Yong; Ma, Yu‐Zhang
- Abstract
We present a statistical study of the ion upflow associated with subauroral polarization streams (SAPS) in the ionospheric subauroral region at different substorm times using three Defense Meteorological Satellite Program satellite (F16–F18) data for five years (2010–2014) in the Northern Hemisphere. The results show similarities between SAPS and the ion upflow at different intensity of substorms both in occurrence rate distribution and velocity distribution. In comparison to SAPS, the distribution of the ion upflow shows the smaller occurrence region and lower velocity. We also find that frictional heating plays an important role in ion upflow from the SAPS region. The intense substorms can trigger strong SAPS channels, enhanced frictional heating, and large ion upflow. In addition, there is a moderate linear correlation between SAPS velocity and field‐aligned velocity that is consistent with some previous findings. Our results also show that frictional heating can gradually dominate the ion upflow process in intense substorms, while it may not be the only factor to affect the whole upflow process. Key Points: Ion upflow is frequently observed near the SAPS flow channel, with similar distributions in the occurrence and velocity as SAPSStatistical analysis shows that field‐aligned (ion upflow) velocity has moderate linear correlation with SAPS velocity indeedFrictional heating can gradually dominate the ion upflow process, while it may not be the only factor to affect such process
- Subjects
NORTHERN Hemisphere; MAGNETIC storms; METEOROLOGICAL satellites; VELOCITY distribution (Statistical mechanics); IONOSPHERE; MAGNETOSPHERE
- Publication
Journal of Geophysical Research. Space Physics, 2020, Vol 125, Issue 3, p1
- ISSN
2169-9380
- Publication type
Article
- DOI
10.1029/2019JA027163