Simulation of solar flare particle interaction with interplanetary shock waves

Physics

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Astronomical Models, Interplanetary Medium, Shock Waves, Solar Cosmic Rays, Solar Flares, Diffusion Coefficient, Monte Carlo Method, Propagation Velocity, Radiation Distribution

Scientific paper

In order to study the propagation of solar cosmic rays in interplanetary space, a computer program has been developed using a Monte-Carlo technique to trace the histories of particles released impulsively at the sun. The particle-propagation model considers adiabatic deceleration during the convective and diffusive transport of the particles, and the model of the interplanetary medium incorporates a radially expanding blast wave which exerts a sweeping action on the particles and accelerates them through the first-order Fermi process. It is shown that energetic storm particle events cannot be simulated by assuming a pure sweeping action of the interplanetary blast wave, but that energization of the particles while reflected at the shock can explain many observed features of such events.

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