A gyrofluid description of Alfvenic turbulence and its parallel electric field

Bian, N.H. and Kontar, E.P. (2010) A gyrofluid description of Alfvenic turbulence and its parallel electric field. Physics of Plasmas, 17(6), (doi:10.1063/1.3439682)

Bian, N.H. and Kontar, E.P. (2010) A gyrofluid description of Alfvenic turbulence and its parallel electric field. Physics of Plasmas, 17(6), (doi:10.1063/1.3439682)

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Abstract

Anisotropic Alfvénic fluctuations with k∥/k⊥⪡1 remain at frequencies much smaller than the ion cyclotron frequency in the presence of a strong background magnetic field. Based on the simplest truncation of the electromagnetic gyrofluid equations in a homogeneous plasma, a model for the energy cascade produced by Alfvénic turbulence is constructed, which smoothly connects the large magnetohydrodynamics scales and the small “kinetic” scales. Scaling relations are obtained for the electromagnetic fluctuations, as a function of k⊥ and k∥. Moreover, a particular attention is paid to the spectral structure of the parallel electric field which is produced by Alfvénic turbulence. The reason is the potential implication of this parallel electric field in turbulent acceleration and transport of particles. For electromagnetic turbulence, this issue was raised some time ago in Hasegawa and Mima [J. Geophys. Res. 83, 1117 (1978)].

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Kontar, Dr Eduard and Bian, Dr Nicolas Horace
Authors: Bian, N.H., and Kontar, E.P.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physics of Plasmas
Publisher:American Institute of Physics
ISSN:1070-664X
ISSN (Online):1089-7674
Published Online:28 June 2010
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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
398461Acceleration, propagation and emission of energetic particles from the sun to the earthEduard KontarParticle Physics & Astronomy Research Council (PPARC)PP/C001656/1Physics and Astronomy
465931Solar, stellar and cosmological plasmas: a synthesis of data, modelling and theory.Declan DiverScience & Technologies Facilities Council (STFC)ST/F002149/1Physics and Astronomy