Temporal variations of nucleonic abundances in solar flare energetic particle events. II - Evidence for large-scale shock acceleration

Details Temporal variations of nucleonic abundances in solar flare energetic particle events. II - Evidence for large-scale shock acceleration Temporal variations of nucleonic abundances in solar flare energetic particle events. II - Evidence for large-scale shock acceleration

May 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...280..902m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 280, May 15, 1984, p. 902-916.

Astronomy and Astrophysics

Astrophysics

60

Abundance, Energetic Particles, Particle Acceleration, Solar Corona, Solar Cosmic Rays, Solar Flares, Nucleons, Particle Flux Density, Shock Waves, Solar Wind

Scientific paper

A survey of the roughly 1 MeV per nucleon ion abundance over the range H-Fe measured with 3 hr time resolution during large solar particle events from November 1973 through December 1977, under near solar minimum conditions, is presented. For all the monitored species, a strong decrease in average flux level occurred with increase of the optical flare site distance from the W 60 deg connection point. The 3 hr abundance ratios He/H, O/He, and Fe/He were observed to fluctuate by a factor of about two about their average values for given flare events, and the size of these fluctuations was independent of the distance to the optical flare site. The monitored abundance ratios exhibited no dependence on distance to the optical flare site. The physical mechanism suggested to explain these observations is large-scale shock acceleration from a shock wave originating at the flare site and propagating as far away as 100 deg heliolongitude.

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