We analyze the plasma motions inside prominences observed by, Hinode/SOT during 2006-2007 with focus on the two spectacular examples fro 25 April 2007 in Ho line and 30 November 2006 in the CaH line. It is no well-known that most filaments (prominences on the limb) are composed of fine threads of similar dimensions. Recent observations of counter-streaming motion,, together with oscillations along the threads provide strong evidence that the threads are field aligned. To more correctly interpret the nature of observed downward flows of dense and cool plasma as well as the upward dark flow of less dense plasma, we take into account the geometry of the prominence structures and the viewing angle. Basic plasma physical considerations lead one to conclude that the magnetic field for the SOT observations considered above must be mainly orthogonal to the plane of the sky.
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