Effects on UV lines observations of stationary plasma flows confined in coronal loops

We describe a method which uses a rather detailed model of coronal loop hos ting a siphon flow as a diagnostic tool to interpret solar UV and X-ray obs ervations in selected bands and lines. We apply the method to investigate t he deviations from ionization equilibrium induced by stationary plasma flow s confined in coronal loops and their effects on the UV and EW emission lin es observed by the instruments on board SOHO. We present results on the det ailed synthesis of loop emission in a set of selected emission lines observ ed by CDS and SUMER, taking into account the nonequilibrium of ionization e ffects. (C) 1999 Elsevier Science Ltd. All rights reserved.