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Article Dans Une Revue Physics of Plasmas Année : 2011

Plasma diffusion in self-consistent fluctuations

Roch Smets
Nicolas Aunai
Laurence Rezeau

Résumé

The problem of particle diffusion in position space, as a consequence of electromagnetic fluctuations is addressed. Numerical results obtained with a self-consistent hybrid code are presented, and a method to calculate diffusion coefficient in the direction perpendicular to the mean magnetic field is proposed. The diffusion is estimated for two different types of fluctuations. The first type (resulting from an agyrotropic initial setting) is stationary, wide band white noise, and associated to Gaussian probability distribution function for the magnetic fluctuations. The second type (resulting from a Kelvin-Helmholtz instability) is non-stationary, with a power-law spectrum, and a non-Gaussian probability distribution function. The results of the study allow revisiting the question of loading particles of solar wind origin in the Earth magnetosphere.

Dates et versions

hal-00635970 , version 1 (26-10-2011)

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Roch Smets, Gérard Belmont, Nicolas Aunai, Laurence Rezeau. Plasma diffusion in self-consistent fluctuations. Physics of Plasmas, 2011, 18, pp.102310. ⟨10.1063/1.3647558⟩. ⟨hal-00635970⟩
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