[en] The SOHO (SOlar and Heliospheric Observatory) satellite was launched on December 2nd 1995. After arriving at the Earth-Sun (L1) Lagrangian point on February 14th 1996, it began to continuously observe the Sun. As one of the instruments onboard SOHO, the EIT (Extreme ultraviolet Imaging Telescope) images the Sun's corona in 4 EUV wavelengths. The He II filter at 304 AË images the chromosphere and the base of the transition region at a temperature of 5 - 8 x 10^4 K; the Fe IX-X filter at 171 AË images the corona at a temperature of ~ 1.3 x 10^6 K; the Fe XII filter at 195 AË images the quiet corona outside coronal holes at a temperature of ~ 1.6 x 10^6 K; and the Fe XV filter at 284 AË images active regions with a temperature of ~ 2.0 x 10^6 K. About 5000 images have been obtained up to the present. In this paper, we describe also some aspects of the telescope and the detector performance for application in the observations. Images and movies of all the wavelengths allow a look at different phenomena present in the Sun's corona, and in particular, magnetic field reconnection.
Research Center/Unit :
CSL - Centre Spatial de Liège - ULiège
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Delaboudiniere, J.-P.; Institut. d'Astrophysique Spatiale, Universite Paris XI 91405 Orsay Cedex, France
Stern, R. A.; Solar and Astrophysics Laboratory, Lockheed Martin Palo Alto, CA 94304, U.S.A.
Maucherat, A.; Laboratoire d'Astronomie Spatiale, BP8 13376 Marseille 12, France
Portier-Fozzani, F.; Laboratoire d'Astronomie Spatiale, BP8 13376 Marseille 12, France
Neupert, W. M.; NASA/Goddard Space Flight Center Greenbelt, MD, U.S.A.
Gurman, J. B.; NASA/Goddard Space Flight Center Greenbelt, MD, U.S.A.
Catura, R. C.; Solar and Astrophysics Laboratory, Lockheed Martin Palo Alto, CA 94304, U.S.A.
Lemen, J. R.; Solar and Astrophysics Laboratory, Lockheed Martin Palo Alto, CA 94304, U.S.A.
Shing, L.; Solar and Astrophysics Laboratory, Lockheed Martin Palo Alto, CA 94304, U.S.A.
Artzner, G. E.; Institut. d'Astrophysique Spatiale, Universite Paris XI 91405 Orsay Cedex, France
Brunaud, J.; Institut. d'Astrophysique Spatiale, Universite Paris XI 91405 Orsay Cedex, France
Gabriel, Alan; Navel Research Laboratory Washington, DC 20365, U.S.A.
Michels, D. J.; Navel Research Laboratory Washington, DC 20365, U.S.A.
Moses, J. D.; Navel Research Laboratory Washington, DC 20365, U.S.A.
Au, B.; Navel Research Laboratory Washington, DC 20365, U.S.A.
Dere, K. P.; Navel Research Laboratory Washington, DC 20365, U.S.A.
Howard, Russell A.; Navel Research Laboratory Washington, DC 20365, U.S.A.
Kreplin, R.; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
Defise, Jean-Marc ; Université de Liège - ULiège > CSL (Centre Spatial de Liège) - Instrumentation et expérimentation spatiales
Chauvineau, J. P.; Observatoire Royal de Belgique Brussels, Belgium
Marioge, J. P.; Observatoire Royal de Belgique Brussels, Belgium
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