A cosmic ray driven instability

Details A cosmic ray driven instability A cosmic ray driven instability

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985icrc....3..121d&link_type=abstract

In NASA. Goddard Space Flight Center 19th Intern. Cosmic Ray Conf., Vol. 3 p 121-123 (SEE N85-34862 23-93)

Computer Science

1

Cosmic Rays, Energetic Particles, High Temperature Plasmas, Magnetohydrodynamic Stability, Magnetohydrodynamic Waves, Particle Interactions, Plasma-Particle Interactions, Shock Waves, Coefficients, Diffusion, Magnetic Fields, Pressure Gradients

Scientific paper

The interaction between energetic charged particles and thermal plasma which forms the basis of diffusive shock acceleration leads also to interesting dynamical phenomena. For a compressional mode propagating in a system with homogeneous energetic particle pressure it is well known that friction with the energetic particles leads to damping. The linear theory of this effect has been analyzed in detail by Ptuskin. Not so obvious is that a non-uniform energetic particle pressure can addition amplify compressional disturbances. If the pressure gradient is sufficiently steep this growth can dominate the frictional damping and lead to an instability. It is important to not that this effect results from the collective nature of the interaction between the energetic particles and the gas and is not connected with the Parker instability, nor with the resonant amplification of Alfven waves.

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