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Electrostatic waves around a magnetopause reconnection diffusion region and their associations with whistler and lower-hybrid waves
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  • Shan Wang,
  • Daniel Bruce Graham,
  • Xin An,
  • Li Li,
  • Qiu-Gang Zong,
  • Xu-Zhi Zhou,
  • Wenya Li,
  • Z.-Y. Liu
Shan Wang
Peking University

Corresponding Author:[email protected]

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Daniel Bruce Graham
Swedish Institute of Space Physics
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Xin An
University of California Los Angeles
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Li Li
Peking University
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Qiu-Gang Zong
Peking University
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Xu-Zhi Zhou
Peking University
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Wenya Li
National Space Science Center, Chinese Academy of Sciences
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Z.-Y. Liu
Peking University
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Abstract

We investigate electrostatic waves in a magnetopause reconnection diffusion region event. In the electron diffusion region on the magnetospheric side, an oblique electrostatic wave is observed. The local distribution exhibits fast non-gyrotropic electron beams with drifts comparable to the electron thermal speed, but the wave has a much lower phase speed. Response of ions and possible cold electrons may contribute to wave excitation. Near the current sheet mid-plane, parallel electron beam-mode waves are modulated by whistler waves. In the separatrix region, parallel waves associated with field-aligned electron beams and perpendicular electron cyclotron waves with loss cone distributions exhibit modulation frequencies in the lower-hybrid wave frequency range. We infer that lower-hybrid waves scatter electrons to produce beams and alter loss cones to modulate electrostatic waves. The results advance our understanding about the regimes and mechanisms of electrostatic waves in reconnection and their coupling with lower-frequency waves.
15 Jun 2023Submitted to ESS Open Archive
23 Jun 2023Published in ESS Open Archive