Fig. 1From: Dynamics of the terrestrial radiation belts: a review of recent results during the VarSITI (Variability of the Sun and Its Terrestrial Impact) era, 2014–2018A schematic illustrating the topology of a CME (reproduced from Zurbuchen and Richardson (2006)). The interplanetary shock ahead of the CME is followed by a turbulent sheath region. Closed magnetic loop lines have counter-streaming particles and may have amagnetic cloud topologyBack to article page