Energetic Electron Microinjections Observed by MMS in the Dusk Plasma Sheet and Drift Resonance Interpretation

Luo，Zhekai1; Xie，Lun1; Fu，Suiyan1; Pu，Zuyin1; Xiong，Ying2; Zhou，Xuzhi1; Zong，Qiugang1; Li，Li1; Russell，C. T.3; Ergun，R. E.4,5; Burch，J. L.6; Blake，J. B.7; Torbert，R. B.6,8; Lindqvist，P. A.9

2022-07-16

10.1029/2022GL098652

GEOPHYSICAL RESEARCH LETTERS   Impact Factor & Quartile

0094-8276

1944-8007

Microinjection phenomena, characterized by dispersive oscillations of electron fluxes at the Pc5 period and bi-directional pitch angle anisotropy, are frequently observed by Magnetospheric Multiscale in the dusk to midnight plasma sheet. In this paper, two such events are analyzed and the features of toroidal mode drift resonance measured meanwhile are shown in detail. The prominent observation is that the fluctuations of the electron flux and the electric field have either −90° or +90° phase difference at the resonant energy, and the phase difference rises as the energy increases. We extend the present theory for drift resonance of toroidal mode wave with only the equatorial moving electrons in a dipole field to include bouncing electrons. The predicted phase differences based on the new theory are consistent well with the observations in the microinjection events. It is thus suggested that drift resonance may act as the forming mechanism for the observed microinjections.

drift resonance microinjection toroidal mode ULF wave

SCI ; EI

English

NI Journal Papers

Others

National Natural Science Foundation of China[41674164];

WOS:000822765000001

20222912359219

Electric fields ; Electrons

Electricity: Basic Concepts and Phenomena:701.1 ; Mechanics:931.1

GEOSCIENCES

2-s2.0-85133919045

Scopus

1.School of Earth and Space Sciences,Peking University,Beijing,China
2.Department of Earth and Space Science,Southern University of Science and Technology,Shenzhen,China
3.University of California,Los Angeles,Los Angeles,United States
4.Laboratory of Atmospheric and Space Physics,University of Colorado,Boulder,United States
5.Department of Astrophysical and Planetary Sciences,University of Colorado,Boulder,United States
6.Southwest Research Institute,San Antonio,United States
7.Space Science Applications Laboratory,The Aerospace Corporation,El Segundo,United States
8.University of New Hampshire,Durham,United States
9.Royal Institute of Technology,Stockholm,Sweden

Luo，Zhekai,Xie，Lun,Fu，Suiyan,et al. Energetic Electron Microinjections Observed by MMS in the Dusk Plasma Sheet and Drift Resonance Interpretation[J]. GEOPHYSICAL RESEARCH LETTERS,2022,49(13).

Luo，Zhekai.,Xie，Lun.,Fu，Suiyan.,Pu，Zuyin.,Xiong，Ying.,...&Lindqvist，P. A..(2022).Energetic Electron Microinjections Observed by MMS in the Dusk Plasma Sheet and Drift Resonance Interpretation.GEOPHYSICAL RESEARCH LETTERS,49(13).

Luo，Zhekai,et al."Energetic Electron Microinjections Observed by MMS in the Dusk Plasma Sheet and Drift Resonance Interpretation".GEOPHYSICAL RESEARCH LETTERS 49.13(2022).