Charge dependence of the solar modulation of multiply charged cosmic ray nuclei

Details Charge dependence of the solar modulation of multiply charged cosmic ray nuclei Charge dependence of the solar modulation of multiply charged cosmic ray nuclei

Sep 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976ap%26ss..44..167p&link_type=abstract

Astrophysics and Space Science, vol. 44, Sept. 1976, p. 167-175. Research supported by the Council of Scientific and Industrial

Physics

Nuclear Physics

1

Charged Particles, Cosmic Rays, Galactic Radiation, Nuclei (Nuclear Physics), Solar Activity Effects, Energy Spectra, Fokker-Planck Equation, Helium, Interstellar Radiation, Modulation, Nuclear Emulsions, Particle Flux Density, Particle Interactions

Scientific paper

The intensity and energy spectra of multiply charged cosmic-ray nuclei in the energy interval from 250 to 1500 MeV/n were studied at three different levels of solar activity. Nuclear emulsion stacks flown from Fort Churchill, Canada, were used to determine simultaneously the energy spectra of helium, carbon, nitrogen, oxygen, and heavy (Z = 10-28) nuclei. Analysis of the measured spectra indicates that these can be interpreted in terms of: (1) a Fermi source spectrum with a spectral index of 2.65; (2) interstellar propagation in a Gaussian distribution of path lengths with a mean path length of 4 g/sq cm; and (3) interplanetary propagation as given by the numerical solution to the Fokker-Planck equation incorporating diffusion, convection, and adiabatic deceleration. On comparing the measured ratios of helium to heavy nuclei (mean Z about 14) with the theoretically calculated values for the three levels of solar activity, it is found that within experimental uncertainties, solar modulation is essentially the same for nuclei with the same mass-to-charge ratio and is not dependent on the charge of the nuclei.

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