New Observations of Fe XVII in the Solar X-ray Spectrum

Summary. New observations of the Fe xvii lines between 13 and 18 A in the solar X-ray spectrum are presented. The observations were made with a high resolution, collimated, crystal spectrometer, and all of the Fe XVH lines are clearly resolved, including the 2p61S0-2p53s3P1 and 3P2 lines near 17A. The relative intensities of the Fe xvii lines are in good agreement with the calculations of Loulergue and Nussbaumer (1973) which include cascade processes. A number of satellite lines of the form 2p6 nl -2p5 3(d)5.n n>3 in Fexvi are also observed. Key words: solar corona - X-rays - Fe xvii