The radial transport of energetic solar flare particles from 1 to 6 AU

Astronomy and Astrophysics – Astronomy

Scientific paper

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Particle Diffusion, Solar Corpuscular Radiation, Solar Flares, Solar Wind Velocity, Transport Properties, Mean Free Path, Particle Acceleration, Particle Flux Density, Pioneer 10 Space Probe, Pioneer 11 Space Probe, Solar Electrons, Solar Protons

Scientific paper

Data from the Pioneer 10 and 11 missions to Jupiter and beyond are used in a study of solar flare accelerated particles at distances of several astronomical units from the sun. The intensity-time profiles out to at least 6 AU are consistent with mainly diffusive interplanetary propagation. The outer boundary of the diffusion region is thought to be beyond 10 AU, since no obvious effects of a free escape boundary were observed. Four solar particle events are discussed in detail. The events are interpreted in terms of a spherically symmetric propagation model which includes the effects of diffusion, convection, and adiabatic deceleration and which assumes that the particles are impulsively injected at the sun.

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