Ultraviolet and optical observations of a coronal transient with SOHO

A coronal transient was observed on 1997 March 6 at 1.6 R. over an active r egion on the east limb. We observed both the edge of horizontally compresse d gas and the diffuse curtain of coronal material. The region was monitored for 4 hr, and the H I Ly alpha, O VI lambda lambda 1031.91, 1037.61, N V l ambda lambda 1242.80, 1238.80, and O V] lambda 1218.35 lines were detected during the ejection evolution. The density, velocity, temperature, and oxyg en abundance of the ejected plasma have been obtained from the observed spe ctra. Intermediate temperature lines of N V, O VI, and O V show a large enh ancement, suggesting a quite narrow range of plasma temperature around 4 x 10(5) K. Doppler shifts of the ejected material evolve from an initial blue shift of 100 km s(-1) to a redshift of 145 km s(-1). The outflow velocity, as determined by Doppler dimming analysis of the O VI doublet, is only abou t 20 km s(-1).