Generation of ULF waves by the Drift-Mirror plasma instability.

We present conclusive evidence of a ULF (Pc5 range) wave generated by the Drift-Mirror plasma instability in Earth's inner magnetosphere. Although seldom discussed, we show that the drift-mirror instability can play an important role in the generation of ultra-low frequency (ULF) waves in Earth's inner magnetosphere. The drift-mirror instability is a high-beta plasma instability, and so we present two year measurements of high-beta events taken by the RBSPICE instrument onboard Van Allen Probes. Thus, we discuss the implications of these new measurements and their role on wave-particle interactions in Earth's inner magnetosphere.