title: Direct evidence for kinetic effects associated with solar wind reconnection.
abstract: Kinetic effects resulting from the two-fluid physics play a crucial role in the fast collisionless reconnection, which is a process to explosively release massive energy stored in magnetic fields in space and astrophysical plasmas. In-situ observations in the Earth's magnetosphere provide solid consistence with theoretical models on the point that kinetic effects are required in the collisionless reconnection. However, all the observations associated with solar wind reconnection have been analyzed in the context of magnetohydrodynamics (MHD) although a lot of solar wind reconnection exhausts have been reported. Because of the absence of kinetic effects and substantial heating, whether the reconnections are still ongoing when they are detected in the solar wind remains unknown. Here, by dual-spacecraft observations, we report a solar wind reconnection with clear Hall magnetic fields. Its corresponding Alfvenic electron outflow jet, derived from the decouple between ions and electrons, is identified, showing direct evidence for kinetic effects that dominate the collisionless reconnection. The turbulence associated with the exhaust is a kind of background solar wind turbulence, implying that the reconnection generated turbulence has not much developed.
authors: 1] Institute of Space Science and Technology, Nanchang University, Nanchang 330031, China [2] State Key Laboratory of Space Weather, Chinese Academy of Sciences, Beijing 100190, China [3] Space Science Institute, Macau University of Science and Technology, Macao, China.
authors: Xiaojun
authors: X
authors: Xu
authors: SIGMA Weather Group, State Key Laboratory of Space Weather, National Space Science Center, Chinese Academy of Sciences, Beijing 100190, China.
authors: Yi
authors: Y
authors: Wang
authors: SIGMA Weather Group, State Key Laboratory of Space Weather, National Space Science Center, Chinese Academy of Sciences, Beijing 100190, China.
authors: Fengsi
authors: F
authors: Wei
authors: SIGMA Weather Group, State Key Laboratory of Space Weather, National Space Science Center, Chinese Academy of Sciences, Beijing 100190, China.
authors: Xueshang
authors: X
authors: Feng
authors: Institute of Space Science and Technology, Nanchang University, Nanchang 330031, China.
authors: Xiaohua
authors: X
authors: Deng
authors: Space Science Institute, Macau University of Science and Technology, Macao, China.
authors: Yonghui
authors: Y
authors: Ma
authors: Institute of Space Science and Technology, Nanchang University, Nanchang 330031, China.
authors: Meng
authors: M
authors: Zhou
authors: Institute of Space Science and Technology, Nanchang University, Nanchang 330031, China.
authors: Ye
authors: Y
authors: Pang
authors: 1] Faculty of Information Technology, Macau University of Science and Technology, Macao, China [2] Space Science Institute, Macau University of Science and Technology, Macao, China.
authors: Hon-Cheng
authors: HC
authors: Wong
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