A dynamic model for the time evolution of the modulated cosmic ray spectrum

Details A dynamic model for the time evolution of the modulated cosmic ray spectrum A dynamic model for the time evolution of the modulated cosmic ray spectrum

May 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975dmte.book.....o&link_type=abstract

Dynamic model for the time evolution of the modulated cosmic-ray spectrum., by O'Gallagher, J. J.; Maslyar, G. A., III. Separat

Astronomy and Astrophysics

Astronomy

Cosmic Rays, Dynamic Models, Diffusion Coefficient, Fokker-Planck Equation

Scientific paper

A recently developed model predicts an energy dependent phase lag in the modulated cosmic ray density U(t) given by U(t) approximately equal to US (t - tau) where US is the solution to the Fokker-Planck equation under time independent conditions and tau is the average time spent by particles inside the modulating region. The delay times tau are functions of modulating parameters R (the radius of the modulating cavity), V (the solar wind velocity), and K (the effective average diffusion-coefficient which is a function of energy). This model is applied to predict the time evolution of the modulated cosmic ray proton spectrum over a simulated solar cycle. A modulation produced mostly by varying R over the solar cycle is less consistent with the observations.

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