Nightside Plasmaspheric Plume?To?Core Migration of Whistler?Mode Hiss Waves

Whistler-mode hiss waves play an important role in the radiation belt electron depletion. Whether with significant differences amplitude and propagation direction within plasmaspheric core plume are related to each other remains unclear. We here show that facilitates energy conversion from energetic electrons then guides into core. Three ground space missions captured initial formation subsequent rotation of noon-dusk-midnight sector following a strong substorm. The observed nightside propagated oppositely but highly correlated at time lag 4–10 s. linear instability qualitatively explains frequency-dependence waves, ray-tracing modeling reproduces timing waves.