Physics – Optics
Scientific paper
Aug 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.4446m&link_type=abstract
Journal of Geophysical Research, vol. 84, Aug. 1, 1979, p. 4446-4450.
Physics
Optics
5
Cosmic Rays, Interplanetary Space, Particle Diffusion, Radial Distribution, Astronomical Models, Diffusion Coefficient, Interplanetary Magnetic Fields, Latitude, Magnetohydrodynamic Waves, Solar Wind Velocity
Scientific paper
The radial diffusion coefficient for cosmic rays is calculated using a rudimentary model of the three-dimensional solar cavity. Cosmic ray scattering is due to resonant interaction with Alfven waves propagating outwards from the sun according to geometrical optics. In addition the latitude dependence of medium scale fluctuations caused by solar wind streams is considered. The latitudinal extent of the weak modulation region around the pole is found to be about 20 deg, although down to about 50 deg latitude significantly higher fluxes are expected. The results also give information on the perpendicular diffusion coefficient. It is quite small. The large intensity gradients in latitude nevertheless may lead to sizeable latitudinal diffusion, although a less pronounced one than in Fisk's (1976) model because of the absence of streams at high latitudes.
Morfill Gregor E.
Voelk Heinrich J.
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