A model for the anisotropic reentry of albedo

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Anisotropic Media, Charged Particles, Cosmic Ray Albedo, Particle Trajectories, Reentry Trajectories, Atmospheric Radiation, Conjugate Points, Particle Energy, Ray Tracing, Trajectory Analysis

Scientific paper

The trajectory-tracing technique was used to obtain the angles of incidence, and hence 'intensities', of negatively charged 0.88-GV particles reentrant at Palestine, Texas. Splash albedo trajectories were traced from the conjugate point, and also from Palestine itself, for those trajectories that were unable to complete a full gyration before reentry into the shadow cone at Palestine. Both isotropic and anisotropic ejection configurations were used at these two locations. These simulations predict a north-south anisotropy (hence also a zenithal anisotropy) for reentrant albedo, with a dearth of trajectories incident from the south. The anisotropy is large enough to explain experimentally determined north-south anisotropies for lower-energy particles, as observed by other groups in the Northern Hemisphere. The results are in agreement with measurements and simulations previously obtained in the Southern Hemisphere.

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