Spectral and compositional variations of low energy ions during an energetic storm particle event

Details Spectral and compositional variations of low energy ions during an energetic storm particle event Spectral and compositional variations of low energy ions during an energetic storm particle event

Dec 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...251..393k&link_type=abstract

Astrophysical Journal, Part 1, vol. 251, Dec. 1, 1981, p. 393-401. Bundesministerium für Forschung und Technologie

Astronomy and Astrophysics

Astrophysics

38

Cosmic Rays, Energetic Particles, Energy Spectra, Interplanetary Medium, Ion Temperature, Particle Acceleration, Abundance, Helium Ions, Hydrogen Ions, Proton Energy, Shock Wave Propagation

Scientific paper

Attention is given to variations in the intensity, energy spectra, and composition of low-energy protons, helium, and heavy ions (C, O, and Fe) in the energy range 0.3-20 MeV per nucleon during an energetic storm particle event on September 28-29, 1978. The intensities of low enery (less than or equal to 0.6 MeV per nucleon) particles are found to increase exponentially with time before the arrival of the moving interplanetary shock front. The increase is largest for the particles of lowest energy. The spectral steepening, expressed in terms of differences in the spectral index, increases for particles of increasing mass per charge ratio from a difference of approximately 1 for protons to approximately 3 for iron. As a consequence, the He/O and C/O ratios at equal energy per nucleon are constant, whereas the He/p, Fe/He, and Fe/O ratios decrease by as much as one order of magnitude before passage of the shock. The observations are analyzed in terms of a first-order Fermi acceleration model with a rigidity dependent interplanetary mean free path.

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