EMIC‐Wave Driven Electron Precipitation Observed by CALET on the International Space Station

We present an analysis of the relativistic electron precipitation (REP) event measured by CALorimetric Electron Telescope (CALET) experiment on board International Space Station during a relatively weak geomagnetic storm 31 December 2016. CALET observations were compared with measurements Van Allen Probes in near-equatorial plane to investigate global radiation belt dynamics and REP drivers. The magnetically conjugate from these two missions demonstrate that significant MeV directly detected low-Earth orbit period depletion following passage high-speed stream, was associated dusk-side electromagnetic ion cyclotron (EMIC) waves. In addition, combined wave, trapped data suggest reported can be likely ascribed concomitant loss effects EMIC wave scattering driving atmospheric precipitation, as well outward radial diffusion magnetopause shadowing.