Temporal variations of nucleonic abundances in solar flare energetic particle events. I - Well-connected events

Details Temporal variations of nucleonic abundances in solar flare energetic particle events. I - Well-connected events Temporal variations of nucleonic abundances in solar flare energetic particle events. I - Well-connected events

Apr 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...267..844m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 267, April 15, 1983, p. 844-862.

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34

Abundance, Energetic Particles, Heavy Ions, Interplanetary Medium, Solar Cosmic Rays, Solar Flares, Diffusion Coefficient, Helium, Iron, Oxygen, Temporal Distribution

Scientific paper

We have surveyed the temporal variations of the relative abundances of 0.6-2.4 MeV per nucleon ions accelerated in solar particle events whose parent flares were located in the so-called well-connected region between W20° and W80° solar longitude. The survey was carried out under solar minimum conditions from 1973 November to 1977 December using the University of Maryland/Max-Planck-Institut ULET telescope on the IMP 8 spacecraft. Several particle events were found which originated in the well-connected region, and of these, two events appeared remarkably free of contamination from other solar particle events or interplanetary disturbances. During the rise phase, the abundances measured at 1 AU were characterized by large (factor of ˜5) decreases in the Fe/O ratios, of the type reported by others, as well as significant decreases in the O/He ratio. After examination of several mechanisms which might cause the abundance variations, it is concluded that the rise phase variations may be understood in terms of interplanetary propagation effects. A detailed comparison of model calculations with the rise phase observations leads to the conclusion that the radial interplanetary scattering mean-free-path varies with rigidity as λr ∝ P0.61±0.18, in agreement with calculations from the quasi-linear theory. However, the size of λr ˜ 0.1-0.2 AU is larger than predicted by the theory.

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