TITLE

Shock formation processes in colliding two collisionless plasmas in a magnetic field

AUTHOR(S)
Yamauchi, Koji; Ohsawa, Yukiharu
PUB. DATE
May 2007
SOURCE
Physics of Plasmas;May2007, Vol. 14 Issue 5, p053110
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Interactions of exploding and surrounding plasmas are analyzed with theory and particle simulations for the case in which the initial velocity v0 of the exploding plasma is perpendicular to the weak external magnetic field B0; because of the fast v0 and weak B0, the gyroradius v0/Ωi is much longer than shock widths. After the penetration of the exploding ions, the electric field induced by the cross-field plasma motion quickly accelerates the surrounding ions in the direction perpendicular to v0 and B0. Owing to the magnetic force, however, the surrounding ions that were once overtaken by the exploding ions can pass them later. Because the electron guiding centers move with the E×B drift, the two kinds of electrons are not mixed. Further, because of the deceleration of the exploding ions in the front layer, the plasma density and magnetic-field strength go up there. This field reflects the surrounding ions forward and exploding ions backward. This generates two large pulses, which then develop into forward and reverse shock waves. Up to the generation of the two pulses, the time and length scales are basically determined by v0 and B0.
ACCESSION #
25298341

 

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