Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-09-22
New J. Phys. 7 (2005) 79
Astronomy and Astrophysics
Astrophysics
Final, accepted in New J. Phys., version, New IMPORTANT material added. Also can be downloaded from http://www.iop.org/EJ/ab
Scientific paper
10.1088/1367-2630/7/1/079
Particle-In-Cell (kinetic) simulations of shear Alfv\'en wave interaction with one dimensional, across the uniform magnetic field, density inhomogeneity (phase mixing) in collisionless plasma were performed for the first time. As a result a new electron acceleration mechanism is discovered. Progressive distortion of Alfv\'en wave front, due to the differences in local Alfv\'en speed, generates nearly parallel to the magnetic field electrostatic fields, which accelerate electrons via Landau damping. Surprisingly, amplitude decay law in the inhomogeneous regions, in the kinetic regime, is the same as in the MHD approximation described by Heyvaerts and Priest (1983).
Saito Shinji
Sakai Jun-Ichi
Tsiklauri David
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