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Title: Local Excitation of Whistler Mode Waves and Associated Langmuir Waves at Dayside Reconnection Regions

Abstract

In the Earth’s dayside reconnection boundary layer, whistler mode waves coincide with magnetic field openings and the formation of the resultant anisotropic electrons. Depending on the energy range of anisotropic electrons, whistlers can grow at frequencies in the upper and/or lower band. Observations show that whistler mode waves modulate Langmuir wave amplitude as they propagate toward the X line. Observations of whistler mode wave phase and Langmuir waves packets, as well as coincident electron measurements, reveal that whistler mode waves can accelerate electrons via Landau resonance at locations where E || is antiparallel to the wave propagation direction. The accelerated electrons produce localized beams, which subsequently drive the periodically modulated Langmuir waves. The close association of those two wave modes reveals the microscale electron dynamics in the exhaust region, and the proposed mechanism could potentially be applied to explain the modulation events observed in planetary magnetospheres and in the solar wind.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [1];  [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [5]; ORCiD logo [6]; ORCiD logo [7]; ORCiD logo [8]; ORCiD logo [9]
  1. Univ. of California, Los Angeles, CA (United States)
  2. Boston Univ., MA (United States)
  3. Univ. of Maryland, College Park, MD (United States)
  4. Univ. of New Hampshire, Durham, NH (United States)
  5. Univ. Paris-Sud, (France)
  6. Univ. of Colorado, Boulder, CO (United States)
  7. KTH Royal Inst. of Technology, Stockholm (Sweden)
  8. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
  9. Southwest Research Inst. (SwRI), San Antonio, TX (United States)
Publication Date:
Research Org.:
Univ. of California, Los Angeles, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1539746
Grant/Contract Number:  
SC0010578
Resource Type:
Accepted Manuscript
Journal Name:
Geophysical Research Letters
Additional Journal Information:
Journal Volume: 45; Journal Issue: 17; Journal ID: ISSN 0094-8276
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; Geology

Citation Formats

Li, Jinxing, Bortnik, Jacob, An, Xin, Li, Wen, Russell, Christopher T., Zhou, Meng, Berchem, Jean, Zhao, Cong, Wang, Shan, Torbert, Roy B., Le Contel, Olivier, Ergun, Robert E., Lindqvist, Per-Arne, Pollock, Craig J., and Burch, James L. Local Excitation of Whistler Mode Waves and Associated Langmuir Waves at Dayside Reconnection Regions. United States: N. p., 2018. Web. doi:10.1029/2018gl078287.
Li, Jinxing, Bortnik, Jacob, An, Xin, Li, Wen, Russell, Christopher T., Zhou, Meng, Berchem, Jean, Zhao, Cong, Wang, Shan, Torbert, Roy B., Le Contel, Olivier, Ergun, Robert E., Lindqvist, Per-Arne, Pollock, Craig J., & Burch, James L. Local Excitation of Whistler Mode Waves and Associated Langmuir Waves at Dayside Reconnection Regions. United States. doi:10.1029/2018gl078287.
Li, Jinxing, Bortnik, Jacob, An, Xin, Li, Wen, Russell, Christopher T., Zhou, Meng, Berchem, Jean, Zhao, Cong, Wang, Shan, Torbert, Roy B., Le Contel, Olivier, Ergun, Robert E., Lindqvist, Per-Arne, Pollock, Craig J., and Burch, James L. Mon . "Local Excitation of Whistler Mode Waves and Associated Langmuir Waves at Dayside Reconnection Regions". United States. doi:10.1029/2018gl078287. https://www.osti.gov/servlets/purl/1539746.
@article{osti_1539746,
title = {Local Excitation of Whistler Mode Waves and Associated Langmuir Waves at Dayside Reconnection Regions},
author = {Li, Jinxing and Bortnik, Jacob and An, Xin and Li, Wen and Russell, Christopher T. and Zhou, Meng and Berchem, Jean and Zhao, Cong and Wang, Shan and Torbert, Roy B. and Le Contel, Olivier and Ergun, Robert E. and Lindqvist, Per-Arne and Pollock, Craig J. and Burch, James L.},
abstractNote = {In the Earth’s dayside reconnection boundary layer, whistler mode waves coincide with magnetic field openings and the formation of the resultant anisotropic electrons. Depending on the energy range of anisotropic electrons, whistlers can grow at frequencies in the upper and/or lower band. Observations show that whistler mode waves modulate Langmuir wave amplitude as they propagate toward the X line. Observations of whistler mode wave phase and Langmuir waves packets, as well as coincident electron measurements, reveal that whistler mode waves can accelerate electrons via Landau resonance at locations where E|| is antiparallel to the wave propagation direction. The accelerated electrons produce localized beams, which subsequently drive the periodically modulated Langmuir waves. The close association of those two wave modes reveals the microscale electron dynamics in the exhaust region, and the proposed mechanism could potentially be applied to explain the modulation events observed in planetary magnetospheres and in the solar wind.},
doi = {10.1029/2018gl078287},
journal = {Geophysical Research Letters},
number = 17,
volume = 45,
place = {United States},
year = {2018},
month = {8}
}

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Cited by: 6 works
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Figures / Tables:

Figure 1 Figure 1: Overview of MMS-4 burst mode measurements in a magnetopause crossing event. (a) Magnetic field in lmn coordinates; (b) electron and ion densities, (c) electron and ion temperature; (d) ion and (e) electron bulk velocities in lmn coordinates, and (f) electron omnidirectional flux. (g–i) Electron pitch angle distributions overmore » the energy range of 20–200 eV, 0.2–2 keV, and 2–30 keV, respectively. (j) Magnetic power spectral densitymeasured at a cadence of 8,192 samples per second. (k) The angle between the wave Poynting flux and the magnetic field. (l) The angle between the k vector and the magnetic field. MMS = Magnetospheric Multiscale.« less

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