Shock-associated energetic proton events at large heliocentric distances

Astronomy and Astrophysics – Astronomy

Scientific paper

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Interplanetary Space, Proton Energy, Shock Wave Propagation, Solar Wind, Anisotropy, Astronomical Models, Density Distribution, Flow Geometry, Particle Acceleration, Particle Flux Density, Pioneer 10 Space Probe, Shock Fronts, Solar Wind Velocity

Scientific paper

The evolving geometry of high-speed solar wind streams is employed to interpret the energetic-proton enhancements observed in association with forward-reverse shock pairs at large heliocentric distances. The time variation in the intensity of the energetic proton events is interpreted in terms of spatial profiles prevailing near the forward and reverse shocks; a gradient in particle density directed along upstream field lines toward the shock provides an indicator of the intensity fluctuations before or following the forward or reverse shock. Steady-state models involving reasonable mean free paths are found to account for the intensity behavior observed in the upstream and downstream regions.

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