The anomalous component of low-energy cosmic rays - A comparison of observed spectra with model calculations

Details The anomalous component of low-energy cosmic rays - A comparison of observed spectra with model calculations The anomalous component of low-energy cosmic rays - A comparison of observed spectra with model calculations

Nov 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jgr....82.5287k&link_type=abstract

Journal of Geophysical Research, vol. 82, Nov. 1, 1977, p. 5287-5291.

Astronomy and Astrophysics

Astronomy

18

Cosmic Rays, Energy Spectra, Interplanetary Medium, Interstellar Gas, Mathematical Models, Solar Activity Effects, Abundance, Astronomical Models, Charge Exchange, Galactic Radiation, Modulation, Neutral Particles, Particle Acceleration, Particle Energy, Solar Wind, Transit Time

Scientific paper

A set of parameters reproducing the quiet time spectra of He, O, N, and Ne as observed at 1 AU during the period 1973-1975 is constructed on the basis of current modulation theory for the transport of low-energy cosmic ray particles and Fisk's (1976) model for their acceleration by transit time damping large-scale field variations in the outer solar system. In this model, the relative abundances of singly ionized ions at injection are calculated from the known ionization rates and the calculated neutral particle distribution in the heliosphere, and the modulation theory includes the effects of diffusion, adiabatic deceleration, and convection. It is shown that both the spectral shapes and the relative intensities for He, O, N, and Ne can simultaneously be fitted remarkably well, where the set of parameters for the fit comprises the acceleration rate, the size of the heliosphere, and the fraction of accelerated singly-ionized particles.

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