Comparison of helium and heavy ion spectra in He-3-rich solar flares with model calculations based on stochastic Fermi acceleration in Alfven turbulence

Details Comparison of helium and heavy ion spectra in He-3-rich solar flares with model calculations based on stochastic Fermi acceleration in Alfven turbulence Comparison of helium and heavy ion spectra in He-3-rich solar flares with model calculations based on stochastic Fermi acceleration in Alfven turbulence

Aug 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...259..397m&link_type=abstract

Astrophysical Journal, Part 1, vol. 259, Aug. 1, 1982, p. 397-410. Bundesministerium für Forschung und Technologie

Astronomy and Astrophysics

Astrophysics

54

Energy Spectra, Helium Isotopes, Iron, Magnetohydrodynamic Waves, Oxygen Ions, Particle Acceleration, Solar Flares, Abundance, Heavy Ions, Solar Cosmic Rays, Solar Spectra, Stochastic Processes

Scientific paper

A systematic study of the He isotopes, 0, and Fe in six 3He-rich solar flares during the 1977-1979 period using the dE/dx versus E Ultralow Energy Wide Angle Telescope (ULEWAT) of the Max-Planck-Institut/University of Maryland experiment on ISEE 1 and ISEE 3 revealed that the 3He spectrum is generally harder than that of 4He, and the O spectrum is harder than that of Fe in the energy range 0.44. MeV per nucleon. At higher energies the flux of the anomalous cosmic ray component exceeds the flux of 4He and O solar particles for 1977. The spectra as measured for 3He and 4He are basically in agreement with a stationary model based on stochastic Fermi acceleration in Alfvén turbulence including the corresponding rigidity-dependent diffusive particle loss. The oxygen and iron spectra, however, differ from the ones predicted by the model: the variation of the Fe/O ratio is larger than predicted. It is suggested that the occasional observation of a maximum of the 3He spectrum is due to a short time injection of 3He and a long time injection of normal composition material.

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