Energy Spectrum of Galactic 10-100 MeV Protons in Quiet Sun Periods

Details Energy Spectrum of Galactic 10-100 MeV Protons in Quiet Sun Periods Energy Spectrum of Galactic 10-100 MeV Protons in Quiet Sun Periods

Jan 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003cosre..41...13l&link_type=abstract

Cosmic Research, v. 41, Issue 1, p. 13-18 (2003).

Physics

1

Scientific paper

The dynamics of the proton energy spectrum during the solar cycle is studied. The spectra were determined by 1-100 MeV particle fluxes measured by different instruments mounted aboard the Earth's IMP-8 satellite for more than one hundred quiet-time intervals in the period between 1974 and 1991. The galactic branch of the spectra (Ep > 10 MeV) constructed for every quiet interval was fitted by a power law function, J = CEν. The theory predicts that in the 1-100 MeV energy range, where the adiabatic cooling of particles is dominant, ν = 1, while we have derived a ν double-peak distribution. The main maximum has the mean value <ν> = 1.35. The mean value of the second, much weaker maximum, is <ν> = 0.95. Within the main maximum, ν values are distributed in accordance with the Gaussian law with a standard deviation = 0.12. The substantial difference of ν from unity requires the elaboration of a new model of modulation processes in the inner heliosphere. The ν values corresponding to the second maximum show that modulation processes correspond sometimes to theoretical conceptions. It is shown that ν correlates weakly with parameters A and γ describing the solar branch of the spectrum (J(E) = AE-γ). At the same time, a more significant correlation is observed between ν and the solar activity index, Rz, the counting rate of the Deep River neutron monitor, and the energy value in the minimum of the energy spectrum flux, Emin.

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