Kappa distributions: theory and applications in space plasmas

Details Kappa distributions: theory and applications in space plasmas Kappa distributions: theory and applications in space plasmas

2010-03-18

arxiv.org/abs/1003.3532v1

Physics

Space Physics

At the time of submission to arxiv this paper is under consideration of editors for publication in a review journal.

Scientific paper

Particle velocity distribution functions (VDF) in space plasmas often show non Maxwellian suprathermal tails decreasing as a power law of the velocity. Such distributions are well fitted by the so-called Kappa distribution. The presence of such distributions in different space plasmas suggests a universal mechanism for the creation of such suprathermal tails. Different theories have been proposed and are recalled in this review paper. The suprathermal particles have important consequences concerning the acceleration and the temperature that are well evidenced by the kinetic approach where no closure requires the distributions to be nearly Maxwellians. Moreover, the presence of the suprathermal particles take an important role in the wave-particle interactions.

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