EIT, The Extreme-Ultraviolet Imaging Telescope on Board SOHO: First Results

Abstract

EIT is a EUV telescope on board SOHO providing wide-field images of the corona and of the transition region, on the solar disc and up to 0.5 Ro above the limb. The multi-coated optics of the telescope select four emission lines to provide temperature diagnostics in a wide range, corresponding to the coronal plasma and the underlying cooler layer. This paper briefly presents the instrument and its first observations.

EIT Science Consortium composition :J.-P. DELABOUDINIERE, G. E. ARTZNER, J. BRUNAUD,A. H. GABRIEL, J. F. HOCHEDEZ, F. MILLIER, and X. Y. SONG, IAS, Orsay, France; B. AU, K. P. DERE, R. A. HOWARD, R. KREPIN, D. J. MICHELS and J. D. MOSES, NRL, Washington DC, USA; J. M. DEFISE, C. JAMAR and P. ROCHUS, CSL, Liège, Belgium; J. P. CHAUVINEAU and J. P.MARIOGE, IOTA, Orsay, France; R. C. CATURA, J. R. LEMEN, L. SHING and R. A. STERN, LPARL, Palo Alto CA, USA; J. B. GURMAN, NASA/GSFC, Greenbelt MD, USA, W. N. NEUPERT SEL/NOAA.Boulder, CO, USA; A. MAUCHERAT, F. PORTIER-FOZZANI, LAS, Marseille, France; F. CLETTE, P. CUGNON, E. VANDESSEL, J.-R. GABRYL, ORB, Bruxelles, Belgium.