SM017-0010
Double dispersions observed near the separatrix

Thursday, 10 December 2020
Poster
Shichen Bai1, Quanqi Shi2, Q. -G. Zong3, Xiaogang Wang4, Anmin Tian2, Alexander W Degeling5, Chao Yue6, Jonathan Rae7, Zuyin Pu6 and Suiyan Fu8, (1)Shandong University at Weihai, Institute of Space Science, Weihai, China, (2)Shandong University at Weihai, Weihai, China, (3)Peking University, Institute of space physics and applied technology school of Earth and Space Sciences,, Beijing, China, (4)HIT Harbin Institute of Technology, Harbin, China, (5)University of Alberta, Physics, Edmonton, Canada, (6)Peking University, Beijing, China, (7)University College London, London, United Kingdom, (8)Peking Univ, Beijing, China
Abstract:
The separatrix has been considered as a key region for particle acceleration in magnetic reconnection. However it has not been studied in detail, because of the insufficient resolution of plasma data. Using MMS burst mode data, we report separatrix crossing cases where dispersions with similar energy range but different time scale have been found in electrons and ions. Due to the E×B drift and velocity filter effect in which high energy particles with high parallel speed can be seen prior to low energy particles along the field line. Both of these dispersions are caused by the E×B drift and velocity filter effect, and the different time scale reflects that duration for E×B drift are different. This indicates that particles are not frozen-in in a distance along the field line close to the separatrix.
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