Physics
Scientific paper
Mar 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83.1157z&link_type=abstract
Journal of Geophysical Research, vol. 83, Mar. 1, 1978, p. 1157-1161.
Physics
17
Electron Scattering, Interplanetary Medium, Mean Free Path, Particle Diffusion, Proton Scattering, Solar Corpuscular Radiation, Diffusion Coefficient, Electron Energy, Magnetic Flux, Proton Energy, Solar Flares
Scientific paper
The paper reports a statistical study of published intensity-time profiles of proton and electron solar particle events from 1967 to 1974. The purpose of the study was to examine systematically the temporal and rigidity dependence of the interplanetary scattering mean free path from approximately 1000 to 3000 MV. The observed t-max, the time from release of particles at the sun to the time of maximum flux at the spacecraft, were interpreted in terms of a propagation model to obtain the average radial scattering mean-free path. This path (1) appears to be species independent when it is derived from proton and electron solar particle events, (2) varies less than a factor of 2 from solar maximum to solar minimum, and (3) is nearly rigidity independent below approximately 500 MV. The path values obtained at low rigidities are inconsistent with path values derived theoretically from the interplanetary magnetic field fluctuations.
Webber William R.
Zwickl R. D.
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