Physics
Scientific paper
Oct 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81.5027s&link_type=abstract
Journal of Geophysical Research, vol. 81, Oct. 1, 1976, p. 5027-5031.
Physics
9
Alpha Particles, Shock Wave Interaction, Solar Cosmic Rays, Solar Flares, Solar Flux, Solar Protons, Abundance, Interplanetary Magnetic Fields, Monte Carlo Method, Sudden Storm Commencements
Scientific paper
The temporal variation of the solar-flare-particle alpha-to-proton ratio during energetic storm particle events is investigated within the framework of a model where a particle gains energy by successive reflections at the moving interplanetary shock front. The basic parameters which produce ratio changes are the energy dependence of the interplanetary diffusion coefficient and, by inference, the power spectral slope of the fluctuations in the interplanetary magnetic field. For an inverse-power-law spectrum with an exponent of -1, the diffusion coefficient is proportional to rigidity times velocity, and the alpha-to-proton ratio is therefore constant at equal energy per change. Monte Carlo simulation of the particle-shock interaction shows that even for power spectral slopes as high as 4/3, the ratio at equal energy per charge does not vary greatly during the event. It is concluded that composition changes during energetic storm particle events reflect (at least in part) the power spectral slope of the magnetic fluctuations responsible for the particle scattering.
Morfill Gregor
Scholer Manfred
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