Abundance enhancements in cosmic rays produced by collisionless shocks

Details Abundance enhancements in cosmic rays produced by collisionless shocks Abundance enhancements in cosmic rays produced by collisionless shocks

Nov 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981phrvl..47.1560e&link_type=abstract

Physical Review Letters, vol. 47, Nov. 23, 1981, p. 1560-1563. NASA-supported research

Astronomy and Astrophysics

Astrophysics

21

Abundance, Collisionless Plasmas, Cosmic Plasma, Cosmic Rays, Heavy Ions, Shock Waves, Approximation, Ion Accelerators, Ion Temperature, Ionic Diffusion, Proton Energy, Thermal Plasmas

Scientific paper

It is shown that shocks preferentially accelerate partially ionized heavy elements over protons. Within the framework of a previously published model of injection, the spectra of different ion species are calculated from thermal to ultrarelativistic energies. For typical astrophysical parameters, the predicted enhancement is in qualitative agreement with observations for a 10 to the 6th K preshock plasma; ions with Z greater than 10 are enhanced by about an order of magnitude or so. The continuing increase with energy of the heavy-element abundances into the air-shower regime is discussed.

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