ИСТИНА

We study possible precipitation of relativistic electrons as a result of resonant interaction with electromagnetic ion cyclotron (EMIC) waves in the He+ band. We combine test particle simulations of energetic electron interaction with EMIC waves in the Pc1 frequency range (~0.2-5 Hz), low-altitude spacecraft observations of EMIC-driven electron precipitations and ground-based observations of Pc1 pulsations at the Lovozero station. We show that despite the low pitch-angle electron transport away from the loss-cone due to effects of force bunching, the scattering from higher pitch-angles results in the loss-cone filling. We also show that finite realistic duration of the wave packets plays an important role.