Diffusive Compression Acceleration of Charged Particles

Details Diffusive Compression Acceleration of Charged Particles Diffusive Compression Acceleration of Charged Particles

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....6.3685j&link_type=abstract

Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I

Physics

1

Scientific paper

We consider the acceleration of fast charged particles by smo oth compressions and expansions in a collisionless fluid, using the diffusion approximation. If the diffusion length κ/U is of the order of the fluid scale or larger, efficient acceleration occurs which has similarities with both 2nd-order Fermi acceleration and diffusive shock acceleration, but is different from both. A simple, one-dimensional sinusoidal flow is analysed. We show that the acceleration dominates, even with equal amounts of compression and expansion. The acceleration time is ≈ κ/U 2 . We suggest that this mechanism may be an important accelerator in regions where there are large-scale compressive disturbances, but few shocks. The mechanism provides a natural explanation of observations in the heliosphere near CIR compressions. It may contribute to the acceleration of cosmic rays elsewhere in the Heliosphere and the galaxy. We suggest the name "diffusive compression acceleration" for this mechanism.

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