Possible evidence for a rigidity-dependent release of relativistic protons from the solar corona

Details Possible evidence for a rigidity-dependent release of relativistic protons from the solar corona Possible evidence for a rigidity-dependent release of relativistic protons from the solar corona

Mar 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982ssrv...32..251s&link_type=abstract

(Slovenska Akademia Vied, IAU, and COSPAR, Study of Travelling Interplanetary Phenomena Workshop on Shock Waves in the Solar Cor

Physics

45

Relativistic Particles, Solar Corona, Solar Cosmic Rays, Solar Flares, Solar Protons, Anisotropy, Backscattering, Energy Spectra, Neutrons

Scientific paper

A model is developed for the time evolving relativistic solar proton spectra of the 7 May 1978 ground level solar cosmic ray event which was characterized by an extreme anisotropy and a rapidly evolving spectrum, especially during the initial phase, and was associated with cosmic ray neutron monitor increases of over 100% and contained relativistic particles with energies greater than 10GeV/nucleon. Results indicate that there was a backscatter pulse from the anti-sun direction that was approximately 4% of the primary pulse observed at the earth about 20 minutes after the onset of the event. There was a preferential release of very energetic particles (greater than 3 GV) from the solar corona, and while lower rigidity particles were present in the initial flux, the majority of these lower rigidity (but still relativistic) particles were released a few minutes later. In addition a unique set of values is found for parameters defining the solar proton differential rigidity spectrum, anisotropy, and apparent source direction that, when transmitted through the asymptotic cone of acceptance for each neutron monitor and through the neutron monitor specific yield function, will reproduce the observed increase at any location on the earth.

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