The influence of the Alfvenic cross and magnetic helicity on the cosmic ray transport equation. I - Isospectral slab turbulence

Details The influence of the Alfvenic cross and magnetic helicity on the cosmic ray transport equation. I - Isospectral slab turbulence The influence of the Alfvenic cross and magnetic helicity on the cosmic ray transport equation. I - Isospectral slab turbulence

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...240..537d&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 240, no. 2, Dec. 1990, p. 537-540.

Statistics

Computation

15

Cosmic Rays, Magnetohydrodynamic Waves, Plasma Turbulence, Transport Theory, Computational Astrophysics, Fokker-Planck Equation, Shock Waves, Solar Wind

Scientific paper

The influence of the cross and magnetic helicities of the Alfvenic slab plasma turbulence on the rate of adiabatic deceleration a(1) and the momentum diffusion coefficient a(2) are discussed, describing the dynamics of cosmic rays on the diffusion-convection equation level. The discussion is restricted to the isospectral case of turbulence where the helicities are constants independent of the wave number k. The results are important for studies of the solar particle propagation and the solar modulation of galactic cosmic rays, in particular the charge dependence of the latter. The values of the transport parameters Kappa, a(1) and a(2) will also influence the studies of cosmic ray dynamics within the hydrodynamical approach which has been used in work on the backreaction of cosmic rays on the shock wave structure and in work on galactic winds driven by cosmic ray pressure.

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