Experimental observation of pinned solitons in a flowing dusty plasma

Pinned solitons are a special class of nonlinear solutions created by supersonically moving object in fluid. They move with the same velocity as and thereby remain pinned to object. A well known hydrodynamical phenomenon, they have been shown exist numerical simulation studies but date not observed experimentally plasma. In this paper we report first experimental excitation dusty (complex) plasma flowing over charged obstacle. The experiments performed {\Pi} shaped Dusty Plasma Experimental (DPEx) device which is background DC glow discharge Ar using micron sized kaolin dust particles. biased copper wire creates potential structure that acts stationary fluid made flow at highly supersonic speed. Under appropriate conditions structures laboratory frame correspond speed obstacle systematic study propagation characteristics these carefully tuning changing height structure. It found nature changes from single humped one multi-humped their amplitudes increase an findings then qualitatively compared model forced Korteweg de Vries (fKdV) equation.