Injection and diffusive transport of suprathermal through energetic solar flare protons (35 keV to 20 MeV)

Physics

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Diffusion Coefficient, Energetic Particles, Proton Energy, Solar Flares, Solar Protons, Transport Properties, Fokker-Planck Equation, International Sun Earth Explorers, Interplanetary Space, Solar Corona

Scientific paper

Consideration is given to the injection and interplanetary propagation of low-energy protons caused by the solar particle event of July 20, 1981, in which flare protons in the range from 35 keV to 20 MeV were observed by instruments on ISEE 3. The observed time-intensity and time-anisotropy profiles were fitted over the entire energy range using a model based on the spherically symmetric Fokker-Plank equation, including convection, diffusion, and adiabitc deceleration. The results are used to discuss the behavior of the radial interplanetary diffusion coefficient and the scattering mean free path for protons. Also, evidence is found for diffusive coronal shock acceleration of protons during the event.

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