Fig. 1From: Wave–particle interaction effects in the Van Allen beltsObservations from the Relativistic Electron–Proton Telescope (REPT) instrument on board the RBSP-A spacecraft for the period 1200–2100 UT on 21 October 2012. Measurements cover the electron energy range from E = 1.80 MeV up to E = 6.95 MeV as indicated by the different colored curves. A shock wave struck the Earth’s magnetosphere at ~ 1540 UT causing abrupt oscillatory flux variations as discussed in the textBack to article page