Physics
Scientific paper
May 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89.2991t&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 89, May 1, 1984, p. 2991-2996.
Physics
23
Cosmic Rays, Forbush Decreases, Interplanetary Space, Shock Waves, Solar Flares, Numerical Integration, Particle Trajectories, Shock Wave Profiles
Scientific paper
It is argued that the principal mechanism for the association of Forbush decreases with the passage of a solar flare shock wave is prolonged containment of cosmic ray particles behind the flare compression region, which acts as a semipermeable obstacle to particle motion along the field lines, leading to additional adiabatic cooling of the particles. Liouville's theorem is used to calculate the instantaneous distribution function at 1 AU for each particle arriving at the earth. By averaging over a large number of individual estimates, a representative estimate of the omnidirectional phase space density and the corresponding particle intensity is obtained. The energy change of individual particles at the shocks is found to be small in comparison to the energy lost by adiabatic cooling of the cosmic rays between the shock wave and the sun. The effects of particle rigidity, diffusion coefficient, and flare longitude on the magnitude of the Forbush decrease are quantitatively investigated.
Gall Ruth
Thomas B. T.
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