Distribution function representation of energy spectra of H, He, C, O and Fe in corotating particle streams

Computer Science

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Abundance, Cosmic Rays, Distribution Functions, Energy Spectra, Particle Beams, Solar Activity Effects, Carbon, Helium, High Energy Interactions, Hydrogen, Iron, Mass Ratios, Oxygen, Plasma-Particle Interactions, Solar Wind

Scientific paper

From an analysis of nine corotating events observed near 1 AU during the 1974-1976 solar minimum, the spectral parameters for H, He, C, O and Fe and relative abundances of these elements and of Ne, Mg, Si, and S-Ca were determined. The distribution functions of H, He, O and Fe are well represented by an exponential in particle speed over the energy range of the measurements from 0.3 to 5 MeV/nucleon. The composition resembles that of the solar corona, particularly in the O/C ratio which is 0.95 + or - 0.19, and the He/H and He/Ne ratios are similar to the respective ratios in the solar wind. The results are consistent with interplanetary statistical acceleration of these particles out of the high-energy tail of the high-speed solar wind.

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