Solar energetic proton mean free paths

Details Solar energetic proton mean free paths Solar energetic proton mean free paths

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993adspr..13..359w&link_type=abstract

Advances in Space Research, Volume 13, Issue 9, p. 359-362.

Computer Science

9

Scientific paper

Mean free paths of solar energetic protons are derived from a power spectral analysis of the magnetic field fluctuations during the time of solar particle events observed on board Helios 1 and 2 in the inner heliosphere by applying quasilinear theory (QLT) under the slab model assumption. For the same events mean free paths are also derived from an analysis of the observed particle time-intensity and time-anisotropy profiles. A comparison of the results from the two approaches reveals that the large discrepancy of a factor of ten between fit and QLT mean free paths, which is commonly cited in the literature, does not appear for a number of events and that the discrepancy, expressed as the ratio of the mean free paths from the particle analysis and from quasilinear theory, can have any size between 0.5 and about 25 for different events for 18.5 MeV protons. This situation implies new requirements for theoretical approaches that attempt to solve the discrepancy problem.

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