Two toroidal regions of energetic charged particles trapped by the geomagnetic field: inner belt (~1.5 R_E, protons up to 100s MeV), outer belt (~4–6 R_E, electrons MeV-class with strong storm-time variability).
Two toroidal regions of energetic charged particles trapped by the geomagnetic field: inner belt (~1.5 R_E, protons up to 100s MeV), outer belt (~4–6 R_E, electrons MeV-class with strong storm-time variability).