Deceleration of Earthward ion flow and acceleration of tailward flow in the near-Earth plasma sheet

Tuesday, 11 July 2017
Furong Room (Cynn Hotel)
Guoqiang Wang, HIT Harbin Institute of Technology, Harbin, China, Tielong Zhang, Space Research Institute, Graz, Austria, Martin Volwerk, Austrian Academy of Sciences, Vienna, Austria and Daniel Schmid, IWF Institute for Space Research, Graz, Austria
Abstract:
We study the accelerations of the Earthward and tailward ion flows under different geomagnetic activity levels using THEMIS data. Flows with larger velocities tend to be decelerated faster with a value from ~-0.1 to -10 km/s2 or larger for the Earthward flow and be accelerated faster with a value from ~0.05 to 1 km/s2 for the tailward flow. At high geomagnetic activity, the deceleration of the Earthward flow tends to decreases when closer to the Earth; while the deceleration could increases for high-speed flow from XGSM = -12 to -8 RE at quiet geomagnetic activity. For high-speed Earthward flow, the deceleration at high geomagnetic activity is larger than that at quiet geomagnetic activity beyond XGSM = -13 RE, and could be smaller at XGSM < -11 RE. For tailward flow, VX at high or quiet geomagnetic activity could be accelerated to a close value from XGSM = -8 to -13 RE, and then stop being accelerated near X = -13 RE.
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