Observation and analysis of low-energy solar particle propagation from discrete flare events

Physics

Scientific paper

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Alpha Particles, Interplanetary Space, Particle Flux Density, Solar Electrons, Solar Flares, Solar Protons, Data Recording, Energy Dissipation, Energy Spectra, Mean Free Path, Particle Energy, Solar Activity Effects

Scientific paper

The proton, alpha-particle, and electron fluxes measured following two west-limb solar flare events are analyzed using numerical solutions to the complete particle-transport equation, including considerations of particle convection and energy loss. The values of the obtained mean free paths suggest that interplanetary propagation conditions were different during these two events. During the Nov. 4, 1968, event the derived values of the mean free paths were about 0.2 to 0.3 AU, while during the November 1969 event the derived values were about 0.1 AU for particles with energies as low as a few MeV. For these events, the rise and decay of the alpha and proton flux profiles can be reasonably reproduced with a distant (10 AU) free-escape boundary.

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