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Kinetic cascade beyond magnetohydrodynamics of solar wind turbulence in two-dimensional hybrid simulations

Verscharen, D. and Marsch, E. and Motschmann, U. and Müller, J. (2012) Kinetic cascade beyond magnetohydrodynamics of solar wind turbulence in two-dimensional hybrid simulations. Physics of Plasma, 19, 022305. AIP. DOI: 10.1063/1.3682960.

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Abstract

The nature of solar wind turbulence in the dissipation range at scales much smaller than the large magnetohydrodynamic (MHD) scales remains under debate. Here, a two-dimensional model based on the hybrid code abbreviated as A.I.K.E.F. is presented, which treats massive ions as particles obeying the kinetic Vlasov equation and massless electrons as a neutralizing fluid. Up to a certain wavenumber in the MHD regime, the numerical system is initialized by assuming a superposition of isotropic Alfve´n waves with amplitudes that follow the empirically confirmed spectral law of Kolmogorov. Then, turbulence develops and energy cascades into the dispersive spectral range, where also dissipative effects occur. Under typical solar wind conditions, weak turbulence develops as a superposition of normal modes in the kinetic regime. Spectral analysis in the direction parallel to the background magnetic field reveals a cascade of left-handed Alfve´n/ion-cyclotron waves up to wave vectors where their resonant absorption sets in, as well as a continuing cascade of righthanded fast-mode and whistler waves. Perpendicular to the background field, a broad turbulent spectrum is found to be built up of fluctuations having a strong compressive component. Ion-Bernstein waves seem to be possible normal modes in this propagation direction for lower driving amplitudes. Also, signatures of short-scale pressure-balanced structures (very oblique slow-mode waves) are found.VC 2012 American Institute of Physics. [doi:10.1063/1.3682960]

Document Type:Article
Title:Kinetic cascade beyond magnetohydrodynamics of solar wind turbulence in two-dimensional hybrid simulations
Authors:
AuthorsInstitution or Email of Authors
Verscharen, D.Max-Planck-Institut für Sonnensystemforschung, Max-Planck-Str. 2, 37191 Katlenburg-Lindau, Germany;Institut für Theoretische Physik, Technische Universität Braunschweig, Mendelssohnstr. 3, 38106 Braunschweig, Germany
Marsch, E.Max-Planck-Institut für Sonnensystemforschung, Max-Planck-Str. 2, 37191 Katlenburg-Lindau, Germany
Motschmann, U.Institut für Theoretische Physik, Technische Universität Braunschweig; uwe.motschmann@dlr.de
Müller, J.Institut für Theoretische Physik, Technische Universität Braunschweig
Date:2012
Journal or Publication Title:Physics of Plasma
Refereed publication:Yes
In Open Access:No
In ISI Web of Science:Yes
Volume:19
DOI:10.1063/1.3682960
Page Range:022305
Publisher:AIP
Status:Published
Keywords:solar wind
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Vorhaben Exploration des Sonnensystems
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Asteroids and Comets
Deposited By: Laura-Maria Brumm
Deposited On:22 Nov 2012 09:08
Last Modified:22 Nov 2012 09:08

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