Dependence of Plasmaspheric Hiss Power on ωpe/Ωce

Plasmaspheric hiss waves play a key role in scattering energetic electrons and are often modeled in the inner magnetosphere using empirical hiss power maps parameterized by L shell. In this study, we compare the dependence of hiss power on both L shell (2 ≤ L ≤ 6) and the ratio of electron plasma frequency to electron gyrofrequency (ω_pe/Ω_ce) using observations from the Van Allen Probes. The statistical comparison spans a wide range of magnetic local times, frequency bands, and substorm activity levels. Hiss power shows a stronger correlation with ω_pe/Ω_ce than with L shell, especially at low frequencies and during periods of enhanced substorm activity. These results indicate that ω_pe/Ω_ce is a more physically meaningful parameter for describing plasmaspheric hiss and should be considered in radiation belt modeling.