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Title: Effects of electron temperature anisotropy on proton mirror instability evolution

Proton mirror modes are large amplitude nonpropagating structures frequently observed in the magnetosheath. It has been suggested that electron temperature anisotropy can enhance the proton mirror instability growth rate while leaving the proton cyclotron instability largely unaffected, therefore causing the proton mirror instability to dominate the proton cyclotron instability in Earth's magnetosheath. In this paper we use particle-in-cell simulations to investigate the electron temperature anisotropy effects on proton mirror instability evolution. Contrary to the hypothesis, electron temperature anisotropy leads to excitement of the electron whistler instability. Finally, our results show that the electron whistler instability grows much faster than the proton mirror instability and quickly consumes the electron-free energy so that there is no electron temperature anisotropy left to significantly impact the evolution of the proton mirror instability.
Authors:
 [1] ;  [2] ;  [2]
  1. Univ. of New Hampshire, Durham, NH (United States). Dept. of Physics
  2. Univ. of New Hampshire, Durham, NH (United States). Dept. of Physics. Space Science Center
Publication Date:
Grant/Contract Number:
SC0006670; AGS-1056898; PHY-1229408
Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Space Physics
Additional Journal Information:
Journal Volume: 121; Journal Issue: 6; Journal ID: ISSN 2169-9380
Publisher:
American Geophysical Union
Research Org:
Univ. of New Hampshire, Durham, NH (United States)
Sponsoring Org:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24); National Science Foundation (NSF)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; temperature anisotropy instabilities; wave-particle interactions
OSTI Identifier:
1469339
Alternate Identifier(s):
OSTI ID: 1402319

Ahmadi, Narges, Germaschewski, Kai, and Raeder, Joachim. Effects of electron temperature anisotropy on proton mirror instability evolution. United States: N. p., Web. doi:10.1002/2016JA022429.
Ahmadi, Narges, Germaschewski, Kai, & Raeder, Joachim. Effects of electron temperature anisotropy on proton mirror instability evolution. United States. doi:10.1002/2016JA022429.
Ahmadi, Narges, Germaschewski, Kai, and Raeder, Joachim. 2016. "Effects of electron temperature anisotropy on proton mirror instability evolution". United States. doi:10.1002/2016JA022429. https://www.osti.gov/servlets/purl/1469339.
@article{osti_1469339,
title = {Effects of electron temperature anisotropy on proton mirror instability evolution},
author = {Ahmadi, Narges and Germaschewski, Kai and Raeder, Joachim},
abstractNote = {Proton mirror modes are large amplitude nonpropagating structures frequently observed in the magnetosheath. It has been suggested that electron temperature anisotropy can enhance the proton mirror instability growth rate while leaving the proton cyclotron instability largely unaffected, therefore causing the proton mirror instability to dominate the proton cyclotron instability in Earth's magnetosheath. In this paper we use particle-in-cell simulations to investigate the electron temperature anisotropy effects on proton mirror instability evolution. Contrary to the hypothesis, electron temperature anisotropy leads to excitement of the electron whistler instability. Finally, our results show that the electron whistler instability grows much faster than the proton mirror instability and quickly consumes the electron-free energy so that there is no electron temperature anisotropy left to significantly impact the evolution of the proton mirror instability.},
doi = {10.1002/2016JA022429},
journal = {Journal of Geophysical Research. Space Physics},
number = 6,
volume = 121,
place = {United States},
year = {2016},
month = {5}
}