Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980icrc....3....7j&link_type=abstract
In: International Cosmic Ray Conference, 16th, Kyoto, Japan, August 6-18, 1979, Conference Papers. Volume 3. (A81-12386 02-93) T
Astronomy and Astrophysics
Astronomy
Astronomical Models, Cosmic Rays, Galactic Radiation, Solar Activity Effects, Energy Spectra, Interplanetary Space, Modulation, Particle Flux Density, Plasma-Particle Interactions, Solar Protons, Solar Wind, Two Dimensional Models
Scientific paper
Numerical solutions are presented of the steady-state modulation of galactic cosmic rays for a realistic two-dimensional model which includes drifts. Calculations of energy spectra and the spatial density variation of protons are shown for a model that incorporates the solar-minimum magnetic field and nominal interplanetary propagation parameters. The calculated values are relatively insensitive to the assumed size of the modulating region and to the magnitude of the particle diffusion coefficient. The solutions show a broad interior 'plateau' in which radial gradients are small. A simple model that neglects diffusion but includes drifts and adiabatic cooling accounts for these results. It is concluded that in this model and the range of parameters, diffusion plays a role secondary to that of drifts and adiabatic cooling.
Jokipii Randy J.
Kopriva D. A.
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