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. Plasmaspheric hiss was observed by Van Allen Probe B in associationwith energetic electron injections in the outer plasmasphere. The energy ofinjected electrons coincides with the minimum resonant energy calculated forthe observed hiss wave frequency. Interestingly, the variations in hiss waveintensity, electron flux and ultra low frequency (ULF) wave intensity exhibit remarkablecorrelations, while plasma density is not correlated with any of theseparameters. Our study provides direct evidence for the first time that theinjected anisotropic electron population, which is modulated by ULF waves,modulates the hiss intensity in the outer plasmasphere. This also impliesthat the plasmaspheric hiss observed by Van Allen Probe B in the outerplasmasphere ( L > ∼  5.5) is locally amplified.Meanwhile, Van Allen Probe A observed hiss emission at lower L shells(  5), which was not associated with electron injections butprimarily modulated by the plasma density. The features observed by Van AllenProbe A suggest that the observed hiss deep inside the plasmasphere may havepropagated from higher L shells.

Van Allen Probes observation of plasmaspheric hiss modulated by injected energetic electrons