Effects of particle drift on cosmic ray transport. II - Analytical solution to the modulation problem with no latitudinal diffusion

Details Effects of particle drift on cosmic ray transport. II - Analytical solution to the modulation problem with no latitudinal diffusion Effects of particle drift on cosmic ray transport. II - Analytical solution to the modulation problem with no latitudinal diffusion

Jan 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...219..740i&link_type=abstract

Astrophysical Journal, Part 1, vol. 219, Jan. 1978, p. 740-749.

Astronomy and Astrophysics

Astrophysics

11

Cosmic Rays, Drift Rate, Galactic Radiation, Interplanetary Medium, Particle Diffusion, Particle Flux Density, Diffusion Coefficient, Modulation, Plasma Interactions, Proton Energy, Solar System, Solar Wind

Scientific paper

An analytical solution to a model of the modulation of galactic cosmic rays in the presence of particle drifts is presented and discussed. The solution assumes an energy-independent radial diffusion coefficient proportional to distance and no latitudinal diffusion, and includes energy-independent particle drift velocities similar to those expected in a Parker spiral magnetic field with an equatorial current sheet. The solutions clearly demonstrate the large effects of drifts on the modulated cosmic-ray intensity. For values of the radial diffusion coefficient and particle drift velocity which are plausible for 1-GV-rigidity protons, the logarithmic radial gradient in the inner solar system is reduced by more than a factor of 5 over the value calculated in the absence of drifts. It is found that even for much smaller values of particle drift velocity and radial diffusion coefficient, such as might be expected for protons with energies of the order of 10 MeV, the effects of the drifts can be substantial.

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