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Title: Simulation of magnetic holes formation in the magnetosheath

Abstract

Magnetic holes have been frequently observed in the Earth's magnetosheath and are believed to be the consequence of the nonlinear evolution of the mirror instability. Mirror mode perturbations mainly form as magnetic holes in regions where the plasma is marginally mirror stable with respect to the linear instability criterion. We present an expanding box particle-in-cell simulation to mimic the changing conditions in the magnetosheath as the plasma is convected through it that produces mirror mode magnetic holes. We show that in the initial nonlinear evolution, where the plasma conditions are mirror unstable, the magnetic peaks are dominant, while later, as the plasma relaxes toward marginal stability, the fluctuations evolve into deep magnetic holes. Finally, while the averaged plasma parameters in the simulation remain close to the mirror instability threshold, the local plasma in the magnetic holes is highly unstable to mirror instability and locally mirror stable in the magnetic peaks.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2]
  1. Univ. of Colorado, Boulder, CO (United States). Lab. for Atmospheric and Space Physics
  2. Univ. of New Hampshire, Durham, NH (United States). Dept. of Physics and Space Science Center
Publication Date:
Research Org.:
Univ. of New Hampshire, Durham, NH (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1514861
Alternate Identifier(s):
OSTI ID: 1414881
Grant/Contract Number:  
SC0006670; PHYS-1229408; TG-MCA98N022
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 24; Journal Issue: 12; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Ahmadi, Narges, Germaschewski, Kai, and Raeder, Joachim. Simulation of magnetic holes formation in the magnetosheath. United States: N. p., 2017. Web. doi:10.1063/1.5003017.
Ahmadi, Narges, Germaschewski, Kai, & Raeder, Joachim. Simulation of magnetic holes formation in the magnetosheath. United States. doi:10.1063/1.5003017.
Ahmadi, Narges, Germaschewski, Kai, and Raeder, Joachim. Tue . "Simulation of magnetic holes formation in the magnetosheath". United States. doi:10.1063/1.5003017. https://www.osti.gov/servlets/purl/1514861.
@article{osti_1514861,
title = {Simulation of magnetic holes formation in the magnetosheath},
author = {Ahmadi, Narges and Germaschewski, Kai and Raeder, Joachim},
abstractNote = {Magnetic holes have been frequently observed in the Earth's magnetosheath and are believed to be the consequence of the nonlinear evolution of the mirror instability. Mirror mode perturbations mainly form as magnetic holes in regions where the plasma is marginally mirror stable with respect to the linear instability criterion. We present an expanding box particle-in-cell simulation to mimic the changing conditions in the magnetosheath as the plasma is convected through it that produces mirror mode magnetic holes. We show that in the initial nonlinear evolution, where the plasma conditions are mirror unstable, the magnetic peaks are dominant, while later, as the plasma relaxes toward marginal stability, the fluctuations evolve into deep magnetic holes. Finally, while the averaged plasma parameters in the simulation remain close to the mirror instability threshold, the local plasma in the magnetic holes is highly unstable to mirror instability and locally mirror stable in the magnetic peaks.},
doi = {10.1063/1.5003017},
journal = {Physics of Plasmas},
number = 12,
volume = 24,
place = {United States},
year = {2017},
month = {12}
}

Journal Article:
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