A dynamic model for the time evolution of the modulated cosmic ray spectrum
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Ogallagher, J. J.↗
Engineering topics
Maslyar, G. A., III
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A dynamic model for the time evolution of the modulated cosmic ray spectrum
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.
Ogallagher, J. J.↗