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Abstract. We report an attenuation of hiss wave intensity in theduskside of the outer plasmasphere in response to enhanced convection anda substorm based on Van Allen Probe observations. Using test particle codes,we simulate the dynamics of energetic electron fluxes based on a realisticmagnetospheric electric field model driven by solar wind and subauroralpolarization stream. We suggest that the enhanced magnetospheric electricfield causes the outward and sunward motion of energetic electrons,corresponding to the decrease of energetic electron fluxes on the duskside,leading to the subsequent attenuation of hiss wave intensity. The resultsindicate that the enhanced electric field can significantly change theenergetic electron distributions, which provide free energy for hiss waveamplification. This new finding is critical for understanding the generationof plasmaspheric hiss and its response to solar wind and substorm activity.