OBSERVATIONS BY THE VAN ALLEN PROBES PROVIDE HIGH-QUALITY ELF/VLF MEASUREMENTS OF THE PARALLEL (TO THE AMBIENT MAGNETIC FIELD) WAVE ELECTRIC FIELD THAT HAVE REVEALED THE FOLLOWING NEW NONLINEAR ELECTRON-SCALE-FEATURES IN THE OUTER RADIATION BELT THAT CAN BE IMPORTANT FOR PARTICLE ACCELERATION AND SCATTERING: - LARGE AMPLITUDE CHORUS WHISTLER WAVES HAVING QUASI-PARALLEL MAGNETIC FIELD PERTURBATIONS ABOVE 1 NT AND OBLIQUE WAVES WITH ELECTRIC FIELD PERTURBATIONS ABOVE 100 MV/M; - WHISTLER WAVES WITH A NONLINEAR ELECTROSTATIC COMPONENT OF THE PARALLEL ELECTRIC FIELD SUGGESTING LANDAU TRAPPING OF HOT ELECTRONS IN THE WAVE EFFECTIVE POTENTIAL; - THE INFLUENCE ON NONLINEAR WAVE-PARTICLE INTERACTIONS BY THE PARAMETERS OF THE ELECTRON DISTRIBUTION FUNCTIONS ON MACROSCOPIC TEMPORAL AND SPATIAL SCALE.

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