Resonant interaction between particles and waves violates the conservation of the magnetic moment and causes diffusion in energy and pitch angle of the interacting particles. If the waves are sufficiently strong and within the right frequency band to resonate with the bulk of the particles, then the resulting pitch angle scattering and precipitation can be extremely important in modifying the structure of the outer zone plasma, in addition to the possibility of producing high energy particles within their ˜forbidden zones.

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