Abstract This study investigates how electron fluxes and chorus waves behave relative to the Kennel–Petschek (K‐P) flux limit using 7 years of Van Allen Probes observations. We combine spatial statistics of when the K‐P limit is exceeded, energy‐dependent flux–wave relationships, and frequency‐resolved chorus spectra to provide a more comprehensive view of the K‐P process in the outer radiation belt. Electron fluxes at 10–100s keV frequently exceed the K‐P limit at 4, with the most intense chorus wave activity occurring where fluxes reach several times the limit on the dawn‐side. We identify a clear statistical transition in the flux‐wave relationship for 90 electrons 200 keV, which weakens with increasing energy. Frequency‐resolved results show that as higher energy electrons exceed the K‐P limit, chorus power becomes concentrated between 0.2 and 0.6 without a shift in central frequency. These findings suggest that the K‐P limiting process is most influential at 10s keV electron fluxes, and that while there may be K‐P processes going on, higher energy dynamics remain ambiguous and difficult to resolve. The results extend the statistical framework of observational K‐P limit studies in both energy and space, further supporting the K‐P process as highly influential in the outer radiation belt.
Walton et al. (2026) studied this question.