Spatial and temporal variations of CIRs: Multi-point observations by STEREO

► Multi-s/c observations of CIRs are presented for Carrington rotations 2067-2082. ► Events showing evolution during co-rotation from STEREO B to STEREO A are analyzed. ► Transients/ICMEs near or embedded within the CIR are a source of temporal evolution. ► This interaction could favor the formation of shocks and thus enhance ion acceleration.