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We study the origin of a CME-related shock within the LASCO C3 field-of-view(FOV). A shock originates, when a CME body velocity on its axis surpasses thetotal velocity $V_A + V_{SW}$, where $V_A$ is the Alfv\'en velocity, $V_{SW}$is the slow solar wind velocity. The formed shock appears collisionless,because its front width is manifold less, than the free path of coronal plasmacharged particles. The Alfv\'en velocity dependence on the distance was foundby using characteristic values of the magnetic induction radial component andof the proton concentration in the Earth orbit, and by using the knownregularities of the variations in these solar wind characteristics withdistance. A peculiarity of the analyzed CME is its formation at a relativelylarge height, and the CME body slow acceleration with distance. We arrived at aconclusion that the formed shock is a bow one relative to the CME body movingat a super Alfv\'en velocity. At the same time, the shock formation involves asteeping of the front edge of the coronal plasma disturbed region ahead of theCME body, which is characteristic of a piston shock.

Origin of a CME-related shock within the LASCO C3 field-of-view