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- W3100173613 abstract "We investigate the deceleration of solar energetic particles (SEPs) during their propagation from the Sun through interplanetary space, in the presence of weak to strong scattering in a Parker spiral configuration, using relativistic full orbit test particle simulations. The calculations retain all three spatial variables describing particles' trajectories, allowing us to model any transport across the magnetic field. Large energy change is shown to occur for protons, due to the combined effect of standard adiabatic deceleration and a significant contribution from particle drift in the direction opposite to that of the solar wind electric field. The latter drift-induced deceleration is found to have a stronger effect for SEP energies than for galactic cosmic rays. The kinetic energy of protons injected at 1 MeV is found to be reduced by between 35% and 90% after four days, and for protons injected at 100 MeV by between 20% and 55%. The overall degree of deceleration is a weak function of the scattering mean free path, showing that, although adiabatic deceleration plays a role, a large contribution is due to particle drift. Current SEP transport models are found to account for drift-induced deceleration in an approximate way and their accuracy will need to be assessed in future work." @default.
- W3100173613 created "2020-11-23" @default.
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- W3100173613 date "2015-07-17" @default.
- W3100173613 modified "2023-10-18" @default.
- W3100173613 title "DRIFT-INDUCED DECELERATION OF SOLAR ENERGETIC PARTICLES" @default.
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- W3100173613 doi "https://doi.org/10.1088/0004-637x/808/1/62" @default.
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