Particle acceleration in step function shear flows - A microscopic analysis

Details Particle acceleration in step function shear flows - A microscopic analysis Particle acceleration in step function shear flows - A microscopic analysis

Jun 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...356..255j&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 356, June 10, 1990, p. 255-258.

Astronomy and Astrophysics

Astrophysics

14

Cosmic Rays, Energetic Particles, Particle Acceleration, Shear Flow, Earth Magnetosphere, Monte Carlo Method, Protons, Radiation Transport, Solar Wind

Scientific paper

The transport of energetic particles in a moving, scattering fluid, which has a large shear in its velocity over a distance small compared with the scattering mean free path is discussed. The analysis is complementary to an earlier paper by Earl, Jokipii, and Morfill (1988), which considered effects of more-gradual shear in the diffusion approximation. The case in which the scattering fluid undergoes a step function change in velocity, in the direction normal to the flow is considered. An analytical, approximate calculation and a Monte Carlo analysis of particle motion are presented. It is found that particles gain energy at a rate proportional to the square of the magnitude of the velocity change.

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