EGU2020-4295, updated on 10 Jan 2023
https://doi.org/10.5194/egusphere-egu2020-4295
EGU General Assembly 2020
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

Electron Bernstein Waves driven by Electron Crescents near the Electron Diffusion Region

Wenya Li1, Daniel Graham2, Binbin Tang1, Andris Vaivads3, Mats Andre2, Kyungguk Min4, Kaijun Liu5, Keizo Fujimoto6, Per Arne Lindqvist3, Kyunghwan Dokgo7, Chi Wang1, and James Burch7
Wenya Li et al.
  • 1State Key Laboratory of Space Weather, National Space Science Center, Chinese Academy of Sciences, Beijing 100190, China
  • 2Swedish Institute of Space Physics, Uppsala SE-75121, Sweden
  • 3Division of Space and Plasma Physics, School of Electrical Engineering and Computer Science, KTH Royal Institute of Technology, Stockholm SE-11428, Sweden
  • 4Department of Astronomy and Space Science, Chungnam National University, Daejeon 34134, Republic of Korea
  • 5Department of Earth and Space Sciences, Southern University of Science and Technology, Shenzhen 518055, China
  • 6School of Space and Environment, Beihang University, Beijing 100191, China
  • 7Southwest Research Institute, San Antonio, Texas 78238, USA.

The Magnetospheric Multiscale spacecraft encounter an electron diffusion region (EDR) of asymmetric magnetic reconnection at Earth's magnetopause. The EDR is characterized by agyrotropic electron velocity distributions on both sides of the neutral line. Various types of plasma waves are produced by the magnetic reconnection in and near the EDR. Here we report large-amplitude electron Bernstein waves (EBWs) at the electron-scale boundary of the Hall current reversal. The finite gyroradius effect of the outflow electrons generates the crescent-shaped agyrotropic electron distributions, which drive the EBWs. The EBWs propagate toward the central EDR. The amplitude of the EBWs is sufficiently large to thermalize and diffuse electrons around the EDR. Our analysis shows that the EBWs contribute to the cross-field diffusion of the electron-scale boundary of the Hall current reversal near the EDR.

How to cite: Li, W., Graham, D., Tang, B., Vaivads, A., Andre, M., Min, K., Liu, K., Fujimoto, K., Lindqvist, P. A., Dokgo, K., Wang, C., and Burch, J.: Electron Bernstein Waves driven by Electron Crescents near the Electron Diffusion Region, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-4295, https://doi.org/10.5194/egusphere-egu2020-4295, 2020.

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