Origin of diffuse superthermal ions at quasi-parallel supercritical collisionless shocks

Details Origin of diffuse superthermal ions at quasi-parallel supercritical collisionless shocks Origin of diffuse superthermal ions at quasi-parallel supercritical collisionless shocks

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9621195k&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Dec. 1, 1991, p. 21,195-21,205.

Physics

37

Magnetosonic Resonance, Particle Acceleration, Shock Waves, Solar Wind, Thermal Plasmas, Mach Number, Magnetic Fields, Thermalization (Energy Absorption)

Scientific paper

The acceleration of upstream energetic ions is studied via self-consistent large-scale 1D hybrid simulations of quasi-parallel shocks. A certain part of the incident ions is accelerated and constitute diffuse upstream particles, which are subject to further scattering in upstream magnetosonic waves of their own making. The ratio of diffuse upstream particles to solar wind particles decreases slightly with increasing shock Mach number and increases with decreasing angle Theta(Bn) between the upstream magnetic field and the shock normal. In the shock frame a few of the backstreaming ions have an energy below the initial energy. The particle distribution is diffuse in velocity space and exhibits a spherical hole, which is approximately centered at the phase velocity of the upstream waves, which indicates that the particle are pitch-angle scattered in the upstream wave field. It is shown that superthermal particles are an integral part of quasi-parallel collisionless shocks and that no particular seed particle population is necessary for shock acceleration.

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