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The existence of shocks driven by Coronal Mass Ejections (CMEs) has alwaysbeen assumed based on the superalfvenic speeds for some of these events and onindirect evidence such as radio bursts and distant streamer deflections.However, the direct signature of the plasma enhancement at the shock front hasescaped detection until recently. Since 2003, work on LASCO observations hasshown that CME-driven shocks can be detected by white light coronagraphobservations from a few solar radii to at least 20 Rsun. Shock properties, suchas the density compression ratio and their direction can be extracted from thedata. We review this work here and demonstrate how to recognize the variousshock morphologies in the images.We also discuss how the two-viewpointcoronagraph observations from the STEREO mission allow the reconstruction ofthe 3D envelope of the shock revealing some interesting properties of theshocks (e.g., anisotropic expansion).

A Review of Coronagraphic Observations of Shocks Driven by Coronal Mass Ejections