Asymptotic Theory of Particle Trapping in Coherent Nonlinear Alfven Waves
M. V. Medvedev, P. H. Diamond, M. N. Rosenbluth, V. I. Shevchenko
Abstract
A fully nonlinear, time-asymptotic theory of resonant particle trapping in large-amplitude quasi-parallel Alfven waves is presented. The effect of trapped particles on the nonlinear dynamics of quasi-stationary Alfvenic discontinuities and coherent Alfven waves is highly non-trivial and forces to a significant departure of the theory from the conventional DNLS and KNLS equation models. The virial theorem is used to determine the time-asymptotic distribution function.
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