The influence of finite injection periods on anisotropies during solar particle events

Details The influence of finite injection periods on anisotropies during solar particle events The influence of finite injection periods on anisotropies during solar particle events

Oct 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974hsde.rept..143s&link_type=abstract

In Arbeitsgemeinschaft für Weltraumforsch. Helios Satellite Sci. Data Evaluation p 143-158 (SEE N75-23393 14-88)

Physics

Diffusion Theory, Injection, Solar Activity Effects, Solar Cosmic Rays, Anisotropy, Helios Project, Interplanetary Space, Particle Diffusion, Propagation (Extension)

Scientific paper

The propagation of solar cosmic rays in interplanetary space is treated in terms of the diffusion theory and by considering a finite, but Gaussian, injection of these particles near the sun. The theory is applicable to the initial phase of a solar event and to times shortly beyond time-of-maximum (tm). A model was developed based on the equations of motion. The results were tested by fitting the intensity and anisotropy profile of the 21.5-60 MeV protons of the November 18, 1968, solar flare event recorded by Pioneer 9 in order to find out the best parameter combination. The calculated intensity profiles matching the observed ones, it is concluded that for one real particle event both intensity and anisotropy measurements plus higher values of the diffusion anisotropy even beyond tm can still be understood in terms of an improved diffusion model when a more realistic, long lasting but finite injection of particles near the sun is additionally taken into account.

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