Enhancement of solar heavy nuclei at high energies in the 4 July 1974 event

Details Enhancement of solar heavy nuclei at high energies in the 4 July 1974 event Enhancement of solar heavy nuclei at high energies in the 4 July 1974 event

Dec 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977soph...55..491b&link_type=abstract

Solar Physics, vol. 55, Dec. 1977, p. 491-497.

Physics

8

Abundance, Heavy Nuclei, Particle Energy, Solar Activity Effects, Solar Corpuscular Radiation, Energy Spectra, Oxygen Spectra, Relativistic Particles, Solar Cosmic Rays, Spectral Correlation

Scientific paper

Relative abundances of energetic nuclei in the July 4, 1974, solar event are presented. The results show a marked enhancement of abundances that systematically increase with nuclear charge numbers in the range of the observation (Z between 6 and 26) for energies above 15 MeV/nucl. While such enhancements are commonly seen below 10 MeV/nucl, most observations at higher energies are found to be consistent with solar-system abundances. The energy spectrum of oxygen is observed to be significantly steeper than most other solar events studied in this energy region. It is proposed that these observations are characteristic of particle populations at energies of the order of 1 MeV/nucl and that the anomalous features observed may be the result of the high-energy extension of such a population that is commonly masked by other processes or populations that might occur in larger solar events.

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