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We study plasma flows along selected coronal loops in NOAA Active Region10926, observed on 3 December 2006 with Hinode's EUV Imaging Spectrograph(EIS). From the shape of the loops traced on intensity images and the Dopplershifts measured along their length we compute their three-dimensional (3D)shape and plasma flow velocity using a simple geometrical model. Thiscalculation was performed for loops visible in the Fe VIII 185 Ang., Fe X 184Ang., Fe XII 195 Ang., Fe XIII 202 Ang., and Fe XV 284 Ang. spectral lines. Inmost cases the flow is unidirectional from one footpoint to the other but thereare also cases of draining motions from the top of the loops to theirfootpoints. Our results indicate that the same loop may show different flowpatterns when observed in different spectral lines, suggesting a dynamicallycomplex rather than a monolithic structure. We have also carried out magneticextrapolations in the linear force-free field approximation using SOHO/MDImagnetograms, aiming toward a first-order identification of extrapolatedmagnetic field lines corresponding to the reconstructed loops. In all cases,the best-fit extrapolated lines exhibit left-handed twist (alpha < 0), inagreement with the dominant twist of the region.

Study of the three-dimensional shape and dynamics of coronal loops observed by Hinode/EIS