On the access and loss of few MeV protons at the geosynchronous orbit

Computer Science

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Earth Magnetosphere, Geosynchronous Orbits, Plasma-Particle Interactions, Proton Energy, Solar Protons, Solar Wind, Cosmic Rays, Energy Dissipation, Particle Trajectories, Satellite Observation

Scientific paper

Data from geostationary satellites have shown that solar protons have access to this orbit with energies well below the calculated cutoff computed by trajectory tracing in a realistic magnetospheric model field. It has been suggested that diffusion processes and/or substantial errors in the magnetospheric field models might be the cause(s) of the discrepancy between theory and observation. Recently Lemaire and colleagues have discussed the impulsive penetration of solar wind plasma irregularities into the magnetosphere; these irregularities can allow the penetration of protons into the magnetosphere to regions well below their nominal cutoff and cause increased scattering of already quasi-trapped solar particles.

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