Resonant ion acceleration by collisionless magnetosonic shock waves
Abstract
Resonant ion acceleration (the upsilon sub p x B acceleration) in laminar magnetosonic shock waves is studied by theory and simulation. Theoretical analysis based on a twofluid model shows that, in laminar shocks, the electric field strength in the direction of the wave normal is about (m sub i/m sub e) sup 1/2 times larger for quasiperpendicular shocks than that for the quasiparallel shocks, which is a reflection of the fact that the width of quasiperpendicular shocks is much smaller than that of the quasiparallel shocks. Trapped ions can be accelerated up to the speed about upsilon sub A (m sub i/m sub e) sup 1/2 (M sub A  1) sup 3/2 in quasiperpendicular shocks. Time evolution of selfconsistent magnetosonic shock waves is studied by using a 21/2 dimensional fully relativistic, fully electromagnetic particle simulation with full ion and electron dynamics. Even a lowMachnumber shock wave can significantly accelerate trapped ions by the upsilon sub p x B acceleration. The resonant ion acceleration occurs more strongly in quasiperpendicular shocks, because the magnitude of this acceleration is proportional to the electric field strength.
 Publication:

In its Proceedings of the USJapan Workshop on Advanced Plasma Modeling 21 p (SEE N8726627 2075
 Pub Date:
 March 1987
 Bibcode:
 1987apm..workS....O
 Keywords:

 Cold Plasmas;
 Computerized Simulation;
 Electric Fields;
 Ions;
 Mathematical Models;
 Particle Acceleration;
 Shock Waves;
 Wave Propagation;
 Applications Programs (Computers);
 Boundary Value Problems;
 Magnetosonic Resonance;
 Plasma Density;
 Poisson Equation;
 Trapped Particles;
 Plasma Physics