The evolution of solar cosmic ray energetic spectrum

Details The evolution of solar cosmic ray energetic spectrum The evolution of solar cosmic ray energetic spectrum

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.535..649f&link_type=abstract

In: Solar variability as an input to the Earth's environment. International Solar Cycle Studies (ISCS) Symposium, 23 - 28 June 2

Physics

Solar Cosmic Rays, Scr Transport, Scr Energetic Spectrum

Scientific paper

The rigorous description of cosmic ray propagation in the interplanetary medium is based on the kinetic equation. This equation describes the scattering of energetic particles on magnetic irregularities and their focusing in a regular interplanetary magnetic field. In the present work in the approximation of a radial regular magnetic field the analytical expressions for solar cosmic ray density and anisotropy are obtained under instantaneous and prolonged particle injection in an interplanetary medium. On the base of kinetic equation solutions the evolution of solar cosmic ray energetic spectra are analysed for a number of solar proton events. Proposed approach allows on the base of experimental data, obtained on the initial phase of proton event, to carry out the short-term prognosis of periods dangerous relative to space radiation, and to determine the levels of energetic particle fluxes in interplanetary medium.

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