Fig. 10
From: History and development of coronal mass ejections as a key player in solar terrestrial relationship
A An interplanetary shock driven by a solar magnetic structure as envisioned by Gold (1962) in order to explain sudden commencement of geomagnetic storms. B An IP shock driven by a magnetic cloud (MC) with a sheath between the shock and MC as inferred from multi-spacecraft observation by Burlaga et al. (1981). C A white-light CME from SOHO/LASCO with a diffused sheath region surrounding the CME from Gopalswamy (2010). Note that the magnetic structure with entrained solar gas (A), magnetic cloud (B), and CME (C) all refer to the flux rope that drives the shock