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Title: Electron Distributions in Kinetic Scale Field Line Resonances: A Comparison of Simulations and Observations

Abstract

Observations in kinetic scale field line resonances, or eigenmodes of the geomagnetic field, reveal highly field-aligned plateaued electron distributions. By combining observations from the Van Allen Probes and Cluster spacecraft with a hybrid kinetic gyrofluid simulation we show how these distributions arise from the nonlocal self-consistent interaction of electrons with the wavefield. This interaction is manifested as electron trapping in the standing wave potential. The process operates along most of the field line and qualitatively accounts for electron observations near the equatorial plane and at higher latitudes. In conjunction with the highly field-aligned plateaus, loss cone features are also evident, which result from the action of the upward-directed wave parallel electric field on the untrapped electron populations.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2];  [3]
  1. Univ. of Alaska, Fairbanks, AK (United States). Geophysical Inst.; Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  2. Univ. of California, Berkeley, CA (United States). Space Sciences Lab.
  3. Andrews Univ., Berrien Springs, MI (United States). Dept. of Engineering and Computer Science
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE; National Science Foundation (NSF); National Aeronautic and Space Administration (NASA)
OSTI Identifier:
1468802
Grant/Contract Number:  
NNH16AC43I; NNX16AR10G; NNH14AY20I; NNX15AF57G; NNX12AD24G; AGS1203299; AGS1405225; AGS1602972; AGS1602941
Resource Type:
Accepted Manuscript
Journal Name:
Geophysical Research Letters
Additional Journal Information:
Journal Volume: 45; Journal Issue: 12; Journal ID: ISSN 0094-8276
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; 42 ENGINEERING

Citation Formats

Damiano, P. A., Chaston, C. C., Hull, A. J., and Johnson, J. R. Electron Distributions in Kinetic Scale Field Line Resonances: A Comparison of Simulations and Observations. United States: N. p., 2018. Web. doi:10.1029/2018gl077748.
Damiano, P. A., Chaston, C. C., Hull, A. J., & Johnson, J. R. Electron Distributions in Kinetic Scale Field Line Resonances: A Comparison of Simulations and Observations. United States. doi:10.1029/2018gl077748.
Damiano, P. A., Chaston, C. C., Hull, A. J., and Johnson, J. R. Thu . "Electron Distributions in Kinetic Scale Field Line Resonances: A Comparison of Simulations and Observations". United States. doi:10.1029/2018gl077748. https://www.osti.gov/servlets/purl/1468802.
@article{osti_1468802,
title = {Electron Distributions in Kinetic Scale Field Line Resonances: A Comparison of Simulations and Observations},
author = {Damiano, P. A. and Chaston, C. C. and Hull, A. J. and Johnson, J. R.},
abstractNote = {Observations in kinetic scale field line resonances, or eigenmodes of the geomagnetic field, reveal highly field-aligned plateaued electron distributions. By combining observations from the Van Allen Probes and Cluster spacecraft with a hybrid kinetic gyrofluid simulation we show how these distributions arise from the nonlocal self-consistent interaction of electrons with the wavefield. This interaction is manifested as electron trapping in the standing wave potential. The process operates along most of the field line and qualitatively accounts for electron observations near the equatorial plane and at higher latitudes. In conjunction with the highly field-aligned plateaus, loss cone features are also evident, which result from the action of the upward-directed wave parallel electric field on the untrapped electron populations.},
doi = {10.1029/2018gl077748},
journal = {Geophysical Research Letters},
number = 12,
volume = 45,
place = {United States},
year = {2018},
month = {6}
}

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