Computer Science
Scientific paper
Jan 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986p%26ss...34...99m&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 34, Jan. 1986, p. 99-116.
Computer Science
17
Anisotropy, Galactic Cosmic Rays, Heliosphere, Interplanetary Space, Solar Wind, Diffusion Theory, Diurnal Variations, Harmonics, Interplanetary Magnetic Fields, Radial Distribution
Scientific paper
The existence of the second- and third-order anisotropies in interplanetary space has been confirmed by observations of solar daily variation. Several theoretical explanations for these anisotropies have been made, assuming a certain density distribution of cosmic rays or only the processes of pitch angle scattering along the spiral magnetic field. Such assumptions, however, are not adequate for explaining the observations and it is necessary to derive the anisotropies from the exact solution to the diffusive propagation of galactic cosmic rays through the heliosphere. In the present paper, the first three-order anisotropies in space are theoretically derived, based on the simulation of the diffusive propagation of cosmic rays through the model heliosphere, and some numerical solutions to the first three harmonics of solar daily variation are shown. Some dependences of the solution to the modulation parameters of the model heliosphere are presented. In the discussion the results are compared with former studies of the higher order cosmic ray anisotropies.
Munakata Koji
Nagashima Kana
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