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SAID/SAPS‐related VLF waves and the outer radiation belt boundary

We explore Cluster and CRRES observations of plasmaspheric broadband hiss‐like VLF emissions related with subauroral ion drifts/polarization streams (SAID/SAPS) to numerically simulate losses of energetic outer zone electrons due to wave‐particle interactions. These emissions represent a distinctive subset of substorm/storm‐related VLF activity in the region co‐located with substorm injected energetic ions. Significant values of pitch‐angle diffusion coefficients suggest that SAID/SAPS‐related VLF waves could be responsible for the alteration of the outer radiation belt boundary during (sub)storms.