Fig. 4From: Wave–particle interaction effects in the Van Allen beltsAdapted from Foster et al. 2014)a Total electric field power spectral density at VLF chorus band frequencies as observed with the EMFISIS instrument on RBSP-A. b Total chorus band wave power between 300 and 3000 Hz and MagEIS 50 keV electron flux (blue curve). c EMFISIS magnetic field magnitude (heavy curve) overplotted on REPT-A 2.85 MeV electron flux observations (red curve) (Back to article page