Nonlinear Waves and Processes Observed on the Van Allen Probes*

The physics of the creation, loss, and transport of radiation belt particles is intimately connected to the electric and magnetic fields which mediate these processes. A large range of field and particle interactions are involved in this physics. To measure these kinds of radiation belt interactions, NASA implemented the two-satellite Van Allen Probes mission. As part of the mission, the Electric and Magnetic Field Instrument Suite and Integrated Science (EMFISIS) investigation provides measurements of magnetic fields from DC to 12 kHz and electric fields from 10 Hz to 400 kHz. We show a variety of non-linear waves thought to be important for wave particle interactions in the radiation belts including EMIC wave rising tones and whistler mode waves including upper and lower band chorus. Several of these wave modes could benefit from laboratory studies to further refine our understanding of the detailed physics of the non-linear wave-particle interactions which lead to energization, pitch angle scattering, and cross-field transport. Examples are shown to illustrate some of these wave/particle processes to show relationships between wave activity and particle processes observed in the inner magnetosphere.