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- W2085601981 abstract "We examine the nonadiabatic motion of charged particles in a field reversal with nonzero B Y . We show that magnetic moment variations are organized into three categories: (1) at small equatorial pitch angles, large magnetic moment enhancements regardless of gyration phase, (2) at intermediate pitch angles, a prominent dependence upon phase with either magnetic moment enhancement or damping, and (3) at large pitch angles, negligible magnetic moment changes. This three‐branch pattern of magnetic moment variations resembles that obtained for zero B Y , but it is here more or less developed when particles enter above or below the field reversal. We investigate this effect using the centrifugal impulse model developed for zero B Y , whereby nonadiabatic behavior is viewed as the result of perturbation of the gyromotion by an impulsive centrifugal force. We show that nonzero B Y leads to a rotation of the centrifugal impulse in the gyration plane and that the nonadiabatic particle behavior is attenuated or enhanced when this rotation opposes or goes together with the gyromotion, respectively. As a consequence of this, particles with opposite charge states or originating from opposite hemispheres behave in quite distinct manners, exhibiting for instance large or negligible magnetic moment changes depending upon their direction of propagation. More generally, we demonstrate that prominent hemispherical differences are obtained as a result of nonzero B Y , be it for injection inside the loss cone or gyrophase bunching near the current sheet midplane." @default.
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- W2085601981 date "2000-01-01" @default.
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- W2085601981 title "Magnetic moment scattering in a field reversal with nonzero <i>B<sub>Y</sub></i> component" @default.
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