Physics – Optics
Scientific paper
Apr 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.1505m&link_type=abstract
Journal of Geophysical Research, vol. 84, Apr. 1, 1979, p. 1505-1513.
Physics
Optics
12
Diffusion Coefficient, Interplanetary Magnetic Fields, Particle Diffusion, Plasma-Particle Interactions, Solar Cosmic Rays, Solar Wind Velocity, Forbush Decreases, Interplanetary Medium, Magnetic Flux, Magnetohydrodynamic Waves, Plasma Density
Scientific paper
By applying a superposed-epoch analysis to the Mariner 5 plasma and magnetic-field observations of 13 corotating high-speed solar-wind streams, the average azimuthal distribution of all relevant parameters of the background interplanetary medium is obtained, as well as those of superimposed Alfven waves. The use of these measurements in model calculations makes it possible to determine the radial and azimuthal variation of the background and fluctuation parameters between 1 and 5 AU and, thus to calculate the cosmic-ray diffusion coefficient, kappa, from the plasma and field properties. The calculation of kappa assumes that quasi-linear wave-particle interaction theory is applicable and that the Alfven waves responsible for the scattering are propagating in the azimuthally varying solar wind according to geometrical optics. The consequences of these calculations regarding the occurrence of solar-wind streams associated Forbush decreases are discussed.
Morfill Gregor
Richter Arne K.
Scholer Manfred
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