ATM evidence for a low nonthermal proton/electron energy flux ratio in solar flares

Details ATM evidence for a low nonthermal proton/electron energy flux ratio in solar flares ATM evidence for a low nonthermal proton/electron energy flux ratio in solar flares

Oct 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...225..650c&link_type=abstract

Astrophysical Journal, Part 1, vol. 225, Oct. 15, 1978, p. 650-654.

Astronomy and Astrophysics

Astrophysics

22

Apollo Telescope Mount, Electron Flux Density, Energy Distribution, Proton Flux Density, Solar Flares, Asymmetry, Chromosphere, Electron Energy, Microwave Radiometers, Satellite-Borne Instruments, Skylab Program, Solar Spectra, Ultraviolet Spectra

Scientific paper

An observational search has been carried out for asymmetry in the wings of L-alpha during flares, produced by beams of nonthermal protons injected into the chromosphere from the corona as suggested by Orrall and Zirker (1976). The data base is the ATM/Skylab EUV spectrograms from the NRL S082B spectrograph. The asymmetries expected to be present in the normal thermal profile are discussed, and detailed consideration is given to the flare that occurred at 1551 UT on August 9, 1973, which was observed during the nonthermal phase. In this flare only very small L-alpha asymmetries are observed, not large enough to be statistically significant. It is shown that this result, combined with microwave radio data for information on nonthermal electrons, implies that the energy flux of nonthermal protons injected into the chromosphere at energies above 20 keV is less than approximately 0.02 times that of electrons of the same energy range in the observed events.

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