Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981izssr..45..557b&link_type=abstract
(Evropeiskii Simpozium po Kosmicheskim Lucham, 7th, Leningrad, USSR, Sept. 15-19, 1980.) Akademiia Nauk SSSR, Izvestiia, Seriia
Astronomy and Astrophysics
Astronomy
Astronomical Models, Cosmic Rays, Fokker-Planck Equation, Interplanetary Medium, Modulation, Interstellar Space, Particle Diffusion, Solar Wind, Space Probes, Transport Theory
Scientific paper
The propagation of cosmic rays in interplanetary space during quiet periods of solar activity is described by the stationary spherically symmetric Fokker-Planck equation. In the present paper, this equation is used to obtain an expression for the radial dependence of the diffusion coefficient on distance in the framework of a model that allows for the nonlinear interaction of galactic cosmic rays with the solar wind as well as charge exchange of solar wind protons with neutral interstellar hydrogen; it is assumed that the solar wind velocity is not constant, but a function of distance. It is found that the penetration of the solar wind into the interstellar medium can be accompanied by a shock transition from supersonic to subsonic motion. In addition, conditions for the propagation of charged particles during disturbances of the solar wind after intense solar flares usually differ from conditions characteristic of quiet periods.
Babaian Kh. V.
Belov Anatoly V.
Dorman Lev I.
Ptuskin Vladimir S.
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