
Alfven's model of discontinuous magnetic field variations for the acceleration of cosmic rays by the betatron mechanism was generalized to continuous field variations. with special reference to sinusoidal fields. It is shown that the efflciency of this model is maximum when the "rate of randomization'' is equal to the frequency of oscillation of the magnetic field. Also the maximum efficiency is comparable with those of Alfven-s and Parker-s models. (auth)
nuclear physics
nuclear physics
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