Gamma-ray lines and neutrons from solar flares

R. Ramaty*, R. J. Murphy, B. Kozlovsky, R. E. Lingenfelter

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


We have derived the energy spectrum of accelerated protons and nuclei at the site of the June 21, 1980 limb flare by a new technique, using observations of the time-dependent flux of high-energy neutrons at the Earth. We find that this energy spectrum is very similar to the energy spectra of 7 disk flares for which the accelerated particle spectra have been previously derived using observations of 4-7MeV-to-2.223 MeV fluence ratios. The implied spectra for all of these flares are too steep (αT ∼- 0.02) to produce any significant amount of radiation from π meson decay. We suggest that the observed >10 MeV gamma rays from the June 21, 1980 flare are bremsstrahlung of relativistic electrons.

Original languageEnglish
Pages (from-to)395-408
Number of pages14
JournalSolar Physics
Issue number1-2
StatePublished - Jul 1983


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