Cross-field transport of less than 1 MeV protons in energetic particle events

Details Cross-field transport of less than 1 MeV protons in energetic particle events Cross-field transport of less than 1 MeV protons in energetic particle events

Oct 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980icrc....5..293z&link_type=abstract

In: International Cosmic Ray Conference, 16th, Kyoto, Japan, August 6-18, 1979, Conference Papers. Volume 5. (A81-12386 02-93) T

Computer Science

Anisotropy, Crossed Fields, Energetic Particles, Particle Diffusion, Solar Protons, Transport Properties, Imp, Mean Free Path, Radiation Detectors, Solar Flares

Scientific paper

A systematic analysis of hourly averaged low-energy anisotropy data (0.3-0.5 MeV) has been carried out with the JHU/APL detectors onboard the IMP-7 and 8 spacecraft from 1972-1975. The energetic particle events were divided into two major groups: flare-associated or nonimpulsive. Resolving the anistropy vectors into components parallel and perpendicular to the measured magnetic field leads directly to the following model-independent conclusions: (1) the average perpendicular anisotropy component is entirely accounted for in terms of the ExB drift, and hence transverse diffusion is negligible at these energies; application of the diffusion model to the nonimpulsive data set implies a ratio of the diffusion mean free paths parallel and perpendicular to the magnetic field much less than 0.051; (2) the parallel anisotropy component averages nearly to zero in the nonimpulsive data set, indicating virtually no net streaming along the field at 1 AU, averaged over all events.

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