Physics
Scientific paper
Apr 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984soph...91..399g&link_type=abstract
Solar Physics, Volume 91, Issue 2, pp.399-413
Physics
4
Scientific paper
Pitch angle scattering of energetic particles (100 MeV) in the interplanetary medium are studied using Helios 1 and 2 magnetometer and plasma data during 1976 near the minimum of solar activity. An IMF configuration was used in the computer experiments which allowed the pitch angle diffusion coefficient, D μμ and hence the parallel mean free path, λ ∥ to be determined. The radial mean free path was found to vary as λ r ˜ r -0.9 between 0.4 and 1 AU, but between 0.3 and 0.4 AU it decreases significantly. To reconcile our value of λ r at 1 AU, lying between 0.01 and 0.02 AU, with the average prompt solar proton event profile, an increasing value of λ r at lower radial distances would be required.
Galicia F. Valdés J.
Moussas Xenophon
Neubauer Fritz Manfred
Quenby John J.
Schwenn Rainer
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