Study of parallel diffusion of energetic particles in the interplanetary medium using spacecraft data at 1 and 5 AU

Details Study of parallel diffusion of energetic particles in the interplanetary medium using spacecraft data at 1 and 5 AU Study of parallel diffusion of energetic particles in the interplanetary medium using spacecraft data at 1 and 5 AU

Aug 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982ap%26ss..86..185m&link_type=abstract

Astrophysics and Space Science, vol. 86, no. 1, Aug. 1982, p. 185-195. Research supported by the Science and Engineering Resear

Astronomy and Astrophysics

Astrophysics

18

Computerized Simulation, Diffusion Coefficient, Energetic Particles, Interplanetary Magnetic Fields, Interplanetary Medium, Particle Trajectories, Explorer 47 Satellite, Heos B Satellite, Particle Diffusion, Particle Energy, Pioneer 10 Space Probe, Pitch (Inclination)

Scientific paper

Energetic (1-100 MeV) particle pitch angle scattering in the IMF was investigated on the basis of IMP 7 and HEOS 2 data at 1 AU and Pioneer 10 data at 5 AU. Particle trajectories were followed by a computer simulation of their movement in a realistic model of the interplanetary magnetic field. The determination of the pitch angle diffusion coefficient at 1 AU leads to a parallel mean free path (approximately 0.03 AU) which is roughly independent of particle energy. At the lowest energy, the present result is at least a factor of 3 larger than the predictions of quasi-linear theory. Results at 5 AU lead to a radial mean free path which is between 2 to 6 times smaller than at 1 AU, which probably indicates a greater importance for perpendicular diffusion at large heliodistances.

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