By the addition of an interplanetary magnetic field in various orientations to a closed magnetosphere model, the Dungey model was generated for all orientations other than a strictly northward interplanetary magnetic field. Particles can be accelerated in both the dayside magnetopause current sheet and in the tail current sheet, but there are inherent asymmetries. Particles may have asymmetric access to the north or the south polar caps, depending on the interplanetary field orientation. The breakdown of the usual adiabatic theory is discussed for a model current sheet.
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