Abstract
The radial velocities determined from the Ha emission line on two Fabry-Perot interferograms at nearly 170 points in the supernova remnant IC 443 have been presented. The mean velocity of the SNR is -3 km -1, while the velocity of expansion is around 60 km -1 The discussion of some specific features indicates that there are appreciable relative mass motions within the assembly of filaments over the supernova shell. In the northern' edge the recession from the observer of two filaments is detected. Along another of the features there is a marked bifurcation, the difference in radial velocity of the two branches reaching up to 76 km -1 It is suggested that a magnetic field along the supernova shell may account for the observed relative motions.
