Local Acceleration in multi-MeV electron enhancement events

During the Van Allen Probes era, several multi-MeV electron enhancements were observed on the REPT instrument. The cause of these multi-MeV (> 4 MeV) remains an ongoing science topic. In this study, we focus on examining the relationship between local acceleration (i.e., chorus wave related wave-particle interactions) and the occurrence of these multi-MeV electron events. Through examining the phase space density (PSD) during these multi-MeV electron events, we can deduce whether local acceleration (i.e., growing PSD peaks) are associated with the acceleration of these relativistic electrons. We also focus on the change in electron density during these multi-MeV electron events, as varying the electron density impacts the chorus wave diffusion coefficients. Through the use of a chorus wave proxy, we can infer the existence of chorus wave activity to help determine the cause of these multi-MeV electron events. Furthermore, we also examine the acceleration of ultra relativistic electrons using both chorus and Z-mode wave activity modeled from Juno observations.