Strong atmospheric disturbances as a possible origin of inner zone particle diusion

A new mechanism of the atmosphere-magnetosphere interaction, which might be called ``acousticmagnetospheric cyclotron accelerator'', is proposed. The idea of this mechanism stems from the fact that strong acoustical perturbations in the ionosphere (e.g., due to earthquakes, thunderstorms, etc.) may generate magnetic disturbances in the magnetosphere. Then, the latter will induce local resonant acceleration and subsequent inward di€usion of trapped particles. This idea may be fruitful in the interpretation of some occasional increases in inner zone particle ̄uxes which do not correlate with the solar or magnetospheric activities.