REDUCTION OF COMPRESSIBILITY AND PARALLEL TRANSFER BY LANDAU DAMPING IN TURBULENT MAGNETIZED PLASMAS

Journal Article · Tue Dec 20 04:00:00 EST 2011 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/743/2/128· OSTI ID:22004483

Hunana, P; Laveder, D; Passot, T; Sulem, P L ^[1]; Borgogno, D ^[2]

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1. Universite de Nice Sophia Antipolis, CNRS, Observatoire de la Cote d'Azur, BP 4229 06304, Nice Cedex 4 (France)
2. Dipartimento di Energetica, Politecnico di Torino, corso Duca degli Abruzzi 24, 10138 Torino (Italy)

Three-dimensional numerical simulations of decaying turbulence in a magnetized plasma are performed using a so-called finite Larmor radius (FLR)-Landau fluid model which incorporates linear Landau damping and FLR corrections. It is shown that compared to simulations of compressible Hall-MHD, linear Landau damping is responsible for significant damping of magnetosonic waves, which is consistent with the linear kinetic theory. Compressibility of the fluid and parallel energy cascade along the ambient magnetic field are also significantly inhibited when the beta parameter is not too small. In contrast with Hall-MHD, the FLR-Landau fluid model can therefore correctly describe turbulence in collisionless plasmas such as solar wind, providing an interpretation for its nearly incompressible behavior.

• OSTI ID: 22004483
• Journal Information: Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 2 Vol. 743; ISSN ASJOAB; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
COLLISIONLESS PLASMA
COMPRESSIBILITY
COMPUTERIZED SIMULATION
LANDAU DAMPING
LARMOR RADIUS
MAGNETIC FIELDS
MAGNETOACOUSTIC WAVES
MAGNETOHYDRODYNAMICS
SOLAR CORONA
SOLAR WIND
SUN
THREE-DIMENSIONAL CALCULATIONS