Magnetic holes in plasmas close to the mirror instability

Non-propagating magnetic hole solutions in anisotropic plasmas near the mirror instability threshold are investigated in numerical simulations of a fluid model that incorporates linear Landau damping and finite Larmor radius corrections calculated in the gyrokinetic approximation. This FLR-Landau fl...

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Published inNonlinear processes in geophysics Vol. 14; no. 4; pp. 373 - 383
Main Authors Borgogno, D, Passot, T, Sulem, P L
Format Journal Article
LanguageEnglish
Published Gottingen Copernicus GmbH 01.01.2007
European Geosciences Union (EGU)
Copernicus Publications
Subjects
Astrophysics
Cosmology and Extra-Galactic Astrophysics
Earth Sciences
Magnetism
Mathematical models
Physics
Plasma physics
Sciences of the Universe
Simulation
Theory
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Summary:Non-propagating magnetic hole solutions in anisotropic plasmas near the mirror instability threshold are investigated in numerical simulations of a fluid model that incorporates linear Landau damping and finite Larmor radius corrections calculated in the gyrokinetic approximation. This FLR-Landau fluid model reproduces the subcritical mirror bifurcation recently identified on the Vlasov-Maxwell system, both by theory and numerics. Stable magnetic hole solutions that display a polarization different from that of Hall-MHD solitons are indeed obtained slighlty below threshold, while magnetic patterns and spatio-temporal chaos emerge when the system is maintained in a mirror unstable regime.
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ISSN:1607-7946
1023-5809
1607-7946
DOI:10.5194/npg-14-373-2007