Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981georl...8..991e&link_type=abstract
Geophysical Research Letters, vol. 8, Sept. 1981, p. 991-994. NASA-supported research.
Astronomy and Astrophysics
Astrophysics
55
Bow Waves, Charged Particles, Computerized Simulation, Ionic Diffusion, Magnetohydrodynamic Flow, Solar Wind, Ion Accelerators, Kinetic Energy, Monte Carlo Method, Shock Waves
Scientific paper
A simple model of the earth's bow shock is presented and compared with ISEE-1 observations of diffuse ions upstream of the shock. Ion behavior is modeled in a test particle simulation using Monte Carlo techniques for a plane parallel shock at which cold solar wind ions are heated sufficiently to allow diffusion back upstream. Fitting of the model to the observations indicates that the diffusion coefficient must increase faster than linearly with velocity, and provides an upper limit to the acceleration efficiency defined as the proportion of incoming solar wind ions accelerated and observed upstream. Results suggest that astrophysical shocks are capable of accelerating ions directly from the thermal plasma without the need for a distinct preenergizing injection stage.
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