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- Title
MMS Observations of Broadband Electrostatic Waves in Electron Diffusion Region of Magnetotail Reconnection .
- Authors
Xiancai Yu; Quanming Lu; Rongsheng Wang; Kai Huang; Xinliang Gao; Shui Wang
- Abstract
In this study, the broadband electrostatic waves are observed in electron diffusion region (EDR). Detailed analysis has shown that the parallel electric field of these waves have a bipolar or continuous steepening waveform. The bipolar structures of the parallel electric field are usually accompanied by electron holes (EHs) in phase space. The parallel spatial scales || l of EHs are ∼3–5 λ D (λ D is the Debye length), and the perpendicular spatial scales λ l are larger than ∼18.6 λ D. Therefore, the length ratios λ || l l / are larger than ∼3.7–6.2, which means that the EHs have oblate shapes. Associated with these plasma waves, electron beams propagating away from the X-line have been observed. By performing a onedimensional (1-D) electrostatic particle-in-cell simulation of the bump-on-tail instability, we reproduce two types of waveforms similar to those observed in the EDR during the different evolution stage of the instability, which implies that these electrostatic waves are generated by the bump-on-tail instabilities
- Subjects
PLASMA electrostatic waves; ELECTRON diffusion; ELECTRIC fields; PLASMA waves; ELECTRON beams
- Publication
Journal of Geophysical Research. Space Physics, 2021, Vol 126, Issue 3, p1
- ISSN
2169-9380
- Publication type
Article
- DOI
10.1029/2020JA028882