[PEM13-P17] Relative contribution of ULF and chorus waves to the radiation belt variation: Comparison between multi-point observations and BATSRUS + CRCM simulation
We focus on the magnetic storm on 27-30 May 2017. This magnetic storm is triggered by coronal mass ejections and induces a clear interplanetary shock. Fortunately, several satellites are scattered in the inner magnetosphere and detect both ULF and chorus waves during this magnetic storm. Arase and Van Allen Probes also detect variations of relativistic electron fluxes associated with the Dst index variation. We examine L-value dependence of ULF and chorus wave powers and find the difference of wave activity during the recovery phase. The chorus wave activity is large during the early recovery phase, while the ULF wave activity is large during the late recovery phase. The difference of wave activity may contribute to the radial profile in the phase space density of relativistic electrons. To grasp the extent of individual wave contribution, we also perform the comprehensive ring current model (CRCM) coupled with Block-Adaptive-Tree Solar-Wind Roe-Type Upwind Scheme (BATSRUS) simulation. BATSRUS with CRCM well reproduces global characteristics of energetic electron fluxes and wave growth during this magnetic storm. We will further evaluate global distribution of simulated wave power comparing to the observation, and then discuss the temporal and spatial context between each wave growth and the radiation belt variation.