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Title: Global Simulation of Electron Cyclotron Harmonic Wave Instability in a Storm-Time Magnetosphere

Abstract

Electron cyclotron harmonic (ECH) waves are electrostatic emissions between the ECHs and play a dominant role for precipitating energetic electrons in the magnetotail. Statistically, the ECH wave intensity is stronger at nightside and dawnside than at dayside and duskside. In this study, we, for the first time, simulate the global ECH wave evolution during a geomagnetic storm event using Ring current Atmosphere interactions Model with Self-Consistent Magnetic field (RAM-SCB) combined with a linear growth rate solver.We find that the simulation results are generally consistent with the statistical and real-time observations. The ECH wave instability is much stronger at nightside and dawnside, compared to the instability at dayside and duskside. Before a geomagnetic storm (quiet time), the unstable regions of the ECH waves lie beyond $$5R_E$$ with a weak instability level. During the main phase of a geomagnetic storm, the unstable regions can extend to a lower altitude $$(3R_E)$$ with a strong instability level. Finally, during the recovery phase, the unstable regions return to $5$ ~ $$6R_E$$. We also find that the inner boundary of unstable ECH wave regions is coincident with the plasmapause location during the whole geomagnetic storm event.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2]
+ Show Author Affiliations
  1. Univ. of Texas at Dallas, Richardson, TX (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
National Aeronautics and Space Administration (NASA); USDOE Laboratory Directed Research and Development (LDRD) Program; National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1604012
Report Number(s):
LA-UR-19-31985
Journal ID: ISSN 0094-8276
Grant/Contract Number:  
89233218CNA000001; 80NSSC18K1112; NNX17AI52G; AGS-1702805
Resource Type:
Accepted Manuscript
Journal Name:
Geophysical Research Letters
Additional Journal Information:
Journal Volume: 47; Journal Issue: 6; Journal ID: ISSN 0094-8276
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; heliospheric and magnetospheric physics; ECH wave global instability; RAM‐SCB model; geomagnetic storm

Citation Formats

Liu, Xu, Chen, Lunjin, Engel, Miles A., and Jordanova, Vania Koleva. Global Simulation of Electron Cyclotron Harmonic Wave Instability in a Storm-Time Magnetosphere. United States: N. p., 2020. Web. https://doi.org/10.1029/2019GL086368.
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Liu, Xu, Chen, Lunjin, Engel, Miles A., & Jordanova, Vania Koleva. Global Simulation of Electron Cyclotron Harmonic Wave Instability in a Storm-Time Magnetosphere. United States. https://doi.org/10.1029/2019GL086368
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Liu, Xu, Chen, Lunjin, Engel, Miles A., and Jordanova, Vania Koleva. Wed . "Global Simulation of Electron Cyclotron Harmonic Wave Instability in a Storm-Time Magnetosphere". United States. https://doi.org/10.1029/2019GL086368. https://www.osti.gov/servlets/purl/1604012.
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@article{osti_1604012,
title = {Global Simulation of Electron Cyclotron Harmonic Wave Instability in a Storm-Time Magnetosphere},
author = {Liu, Xu and Chen, Lunjin and Engel, Miles A. and Jordanova, Vania Koleva},
abstractNote = {Electron cyclotron harmonic (ECH) waves are electrostatic emissions between the ECHs and play a dominant role for precipitating energetic electrons in the magnetotail. Statistically, the ECH wave intensity is stronger at nightside and dawnside than at dayside and duskside. In this study, we, for the first time, simulate the global ECH wave evolution during a geomagnetic storm event using Ring current Atmosphere interactions Model with Self-Consistent Magnetic field (RAM-SCB) combined with a linear growth rate solver.We find that the simulation results are generally consistent with the statistical and real-time observations. The ECH wave instability is much stronger at nightside and dawnside, compared to the instability at dayside and duskside. Before a geomagnetic storm (quiet time), the unstable regions of the ECH waves lie beyond $5R_E$ with a weak instability level. During the main phase of a geomagnetic storm, the unstable regions can extend to a lower altitude $(3R_E)$ with a strong instability level. Finally, during the recovery phase, the unstable regions return to $5$ ~ $6R_E$. We also find that the inner boundary of unstable ECH wave regions is coincident with the plasmapause location during the whole geomagnetic storm event.},
doi = {10.1029/2019GL086368},
journal = {Geophysical Research Letters},
number = 6,
volume = 47,
place = {United States},
year = {2020},
month = {2}
}
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