Energetic Electron Diffusion and Precipitation Driven by Ducted Hiss Waves in High Density Irregular Region

Plasmaspheric hiss plays an important role for the electron precipitation and the formation of slot in radiation belts. It is easy for hiss waves to resonate with and scatter energetic electrons at higher L shells, as the frequencies of hiss waves decrease with the distance away from the earth. Recent studies show the whistler-mode waves can be guided in the density irregularities, performing parallel propagation experiencing little Landau damping. Therefore, the resonance between ducted waves and energetic electrons can expand to higher latitudes, and then drive strong energetic electron scattering. In this study, we report a conjugate observation using data from Van Allen Probe A in the magnetosphere and POES satellite in the ionosphere. Through the analysis of both observation and the quantification of quasi-linear diffusion coefficients, the results show the ducted hiss can more effectively scatter the energetic electrons and drive enhanced electron flux at low ionospheric altitudes. We suggest the ducting propagation of hiss is important for electron loss process in radiation belts.