Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 32, Issue 6, Pages -Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2005GL022373
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A mechanism for prompt trapping of solar energetic particles (SEPs) in the inner magnetosphere during severe storms is numerically demonstrated. The mechanism can be understood in terms of a generalization of Stormer theory to a time dependently perturbed dipole magnetic field. Test particle Lorentz trajectories are computed in fields from a Lyon-Feder-Mobarry (LFM) global MHD magnetospheric model simulation of the 24 Nov 2001 storm to show energetic particles may be impulsively injected into the magnetosphere and trapped on a time scale of minutes by a sudden compression and de-compression of the magnetosphere. It is also shown that SEPs with access to the innermost L-shells enter through the magnetopause on the day side.
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