Threshold effect in second-stage acceleration

Details Threshold effect in second-stage acceleration Threshold effect in second-stage acceleration

Mar 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978soph...57..237h&link_type=abstract

Solar Physics, vol. 57, Mar. 1978, p. 237-240.

Physics

19

Particle Acceleration, Proton Flux Density, Solar Flares, Solar Protons, Proton Density (Concentration), Solar X-Rays, Thresholds

Scientific paper

The size distributions of several observable parameters of solar flares are examined in order to clarify certain aspects of proton-flare behavior. Distribution functions are presented for solar soft and hard X radiation, microwave bursts, and proton fluxes; the distributions had been measured at different times and for flares of different magnitude ranges. It is shown that protons have a flatter distribution of occurrence than the other flare parameters, that proton production depends very strongly on total flare energy, and that the uncertainty in proton-event size distributions permits an interpretation in terms of some absolute threshold. It is concluded that the second-stage acceleration mechanism operates much more efficiently for more energetic flares, with large fluxes having more than proportionally greater proton production.

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