Abstract
The November 22, 1977 solar flare was observed at energies up to 4.9 MeV by French-built gamma ray detectors aboard the Soviet Prognoz-6 satellite. The data show evidence for 2.23 and 4.43 MeV line emission, with the 2.23 MeV emission occurring about 3 min after the flare onset in hard X-rays. The line intensities, 0.11 cm−2s−1 and ∼0.06 cm−2s−1 for the 2.23 and 4.43 lines, respectively, are roughly comparable to intensities observed in other events. Particle detectors aboard the Prognoz-6 satellite, however, recorded a proton flux much lower than that observed for the 4 August 1972 event. It is shown that this may be taken as evidence for a thick target interpretation of the proton interactions in the solar atmosphere.
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Chambon, G., Hurley, K., Niel, M. et al. The November 22, 1977 solar flare: Evidence for 2.23 and 4.43 MeV line emission from the signe 2MP experiment. Sol Phys 69, 147–159 (1981). https://doi.org/10.1007/BF00151262
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DOI: https://doi.org/10.1007/BF00151262