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Title: SUPPRESSION OF REFLECTED ELECTRONS BY KINETIC ALFVEN TURBULENCE IN A QUASI-PERPENDICULAR SHOCK: PARTICLE-IN-CELL SIMULATIONS

Abstract

Shock drift acceleration is one of the important mechanisms for electron acceleration associated with magnetic mirror reflection along the magnetic field in a quasi-perpendicular collisionless shock. We study the influence of a rippled shock surface in the in-plane magnetic field on the magnetic mirror reflection of electrons. Simulation results show that the number of reflected electrons reduces after generation of the rippled shock surface. Electric and magnetic wavenumber spectra of the generated fluctuations in the shock transition region indicate the existence of kinetic Alfven turbulence. The kinetic Alfven turbulence decreases the electron pitch angle by parallel scattering, which reduces the magnetic mirror force acting on the electrons. These results suggest that the shock-generated kinetic Alfven turbulence suppresses the magnetic mirror reflection of electrons during the shock drift acceleration.

Authors:
;  [1]
  1. Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, Aichi 464-8601 (Japan)
Publication Date:
OSTI Identifier:
21578335
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 736; Journal Issue: 1; Other Information: DOI: 10.1088/0004-637X/736/1/35; Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCELERATION; ALFVEN WAVES; ELECTRONS; FLUCTUATIONS; INHIBITION; MAGNETIC FIELDS; MAGNETIC MIRRORS; REFLECTION; SHOCK WAVES; SIMULATION; TURBULENCE; ELEMENTARY PARTICLES; FERMIONS; HYDROMAGNETIC WAVES; LEPTONS; OPEN PLASMA DEVICES; THERMONUCLEAR DEVICES; VARIATIONS

Citation Formats

Saito, S., and Umeda, T. SUPPRESSION OF REFLECTED ELECTRONS BY KINETIC ALFVEN TURBULENCE IN A QUASI-PERPENDICULAR SHOCK: PARTICLE-IN-CELL SIMULATIONS. United States: N. p., 2011. Web. doi:10.1088/0004-637X/736/1/35.
Saito, S., & Umeda, T. SUPPRESSION OF REFLECTED ELECTRONS BY KINETIC ALFVEN TURBULENCE IN A QUASI-PERPENDICULAR SHOCK: PARTICLE-IN-CELL SIMULATIONS. United States. doi:10.1088/0004-637X/736/1/35.
Saito, S., and Umeda, T. Wed . "SUPPRESSION OF REFLECTED ELECTRONS BY KINETIC ALFVEN TURBULENCE IN A QUASI-PERPENDICULAR SHOCK: PARTICLE-IN-CELL SIMULATIONS". United States. doi:10.1088/0004-637X/736/1/35.
@article{osti_21578335,
title = {SUPPRESSION OF REFLECTED ELECTRONS BY KINETIC ALFVEN TURBULENCE IN A QUASI-PERPENDICULAR SHOCK: PARTICLE-IN-CELL SIMULATIONS},
author = {Saito, S. and Umeda, T.},
abstractNote = {Shock drift acceleration is one of the important mechanisms for electron acceleration associated with magnetic mirror reflection along the magnetic field in a quasi-perpendicular collisionless shock. We study the influence of a rippled shock surface in the in-plane magnetic field on the magnetic mirror reflection of electrons. Simulation results show that the number of reflected electrons reduces after generation of the rippled shock surface. Electric and magnetic wavenumber spectra of the generated fluctuations in the shock transition region indicate the existence of kinetic Alfven turbulence. The kinetic Alfven turbulence decreases the electron pitch angle by parallel scattering, which reduces the magnetic mirror force acting on the electrons. These results suggest that the shock-generated kinetic Alfven turbulence suppresses the magnetic mirror reflection of electrons during the shock drift acceleration.},
doi = {10.1088/0004-637X/736/1/35},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 1,
volume = 736,
place = {United States},
year = {2011},
month = {7}
}