Evaluation of interplanetary magnetic helicity effects on particle propagation at times of observed solar proton events

Details Evaluation of interplanetary magnetic helicity effects on particle propagation at times of observed solar proton events Evaluation of interplanetary magnetic helicity effects on particle propagation at times of observed solar proton events

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9821077v&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A12, p. 21,077-21,084

Astronomy and Astrophysics

Astronomy

3

Energy Spectra, Interplanetary Magnetic Fields, Magnetic Effects, Particle Trajectories, Power Spectra, Proton Scattering, Solar Protons, Wave-Particle Interactions, Astronomical Spectroscopy, Helices, Helios Satellites, Perturbation, Space Plasmas, Spaceborne Astronomy

Scientific paper

Power and helicity density spectra of the interplanetary magnetic field (IMF) are determined from data measured on board Helios spacecraft at times of three solar proton events (SPE) when they were at heliocentric distances ranging from 0.3 to 0.5 AU. The events were selected to represent different levels of perturbation in the IMF. The obtained spectra are also different in the three cases. These are used to calculate pitch angle scattering coefficients according to the classical quasi-linear theory (QLT) treatment of particle propagation in fluctuating fields. Results reflect that in the three cases helicity effects are negligible and the energetic particle mean free paths deduced from the pitch angle diffusion coefficients are the same regardless of whether helicity effects are or are not included in the calculation. Note, however, that the mean free paths calculated here are markedly different in each case, and all of them are larger than those deduced by Jokipii and Coleman (1968), commonly referenced as the QLT result.

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