Article (Scientific journals)
EIT Observations of the Extreme Ultraviolet Sun
Moses, D.; Clette, Frédéric; Delaboudinière, J.-P. et al.
1997In Solar Physics, 175, p. 571-599
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Abstract :
[en] The Extreme Ultraviolet Imaging Telescope (EIT) on board the SOHO spacecraft has been operational since 2 January 1996. EIT observes the Sun over a 45 x 45 arc min field of view in four emission line groups: Feix, x, Fexii, Fexv, and Heii. A post-launch determination of the instrument flatfield, the instrument scattering function, and the instrument aging were necessary for the reduction and analysis of the data. The observed structures and their evolution in each of the four EUV bandpasses are characteristic of the peak emission temperature of the line(s) chosen for that bandpass. Reports on the initial results of a variety of analysis projects demonstrate the range of investigations now underway: EIT provides new observations of the corona in the temperature range of 1 to 2 MK. Temperature studies of the large-scale coronal features extend previous coronagraph work with low-noise temperature maps. Temperatures of radial, extended, plume-like structures in both the polar coronal hole and in a low latitude decaying active region were found to be cooler than the surrounding material. Active region loops were investigated in detail and found to be isothermal for the low loops but hottest at the loop tops for the large loops.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Moses, D.;  Naval Research Laboratory
Clette, Frédéric;  Institut d'Astrophysique Spatiale, Université Paris XI, 91405
Delaboudinière, J.-P.;  Institut d'Astrophysique Spatiale, Université Paris XI, 91405
Artzner, G. E.;  Institut d'Astrophysique Spatiale, Université Paris XI, 91405
Bougnet, M.;  Institut d'Astrophysique Spatiale, Université Paris XI, 91405
Brunaud, J.;  Institut d'Astrophysique Spatiale, Université Paris XI, 91405
Carabetian, C.;  Institut d'Astrophysique Spatiale, Université Paris XI, 91405
Gabriel, Alan;  Institut d'Astrophysique Spatiale, Université Paris XI, 91405
Hochedez, Jean-François;  Institut d'Astrophysique Spatiale, Université Paris XI, 91405
Millier, F.;  Naval Research Laboratory
Song, X. Y.;  Naval Research Laboratory
Au, B.;  Naval Research Laboratory
Dere, K. P.;  Naval Research Laboratory
Howard, Russell A.;  Naval Research Laboratory
Kreplin, R.;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
Michels, D. J.;  Université de Liège - ULiège > CSL (Centre Spatial de Liège) - Instrumentation et expérimentation spatiales
Defise, Jean-Marc ;  Institut d'Optique Théorique et Appliquée
Chauvineau, J. P.;  Lockheed Palo Alto Research Laboratory
Marioge, J. P.;  Lockheed Palo Alto Research Laboratory
Catura, R. C.;  Lockheed Palo Alto Research Laboratory
Lemen, J. R.;  NASA/Goddard Space Flight Center
Shing, L.;  NASA/Goddard Space Flight Center
Stern, R. A.;  NASA/Goddard Space Flight Center
Gurman, J. B.;  NASA/Goddard Space Flight Center
Neupert, W. M.;  Laboratoire d'Astronomie Spatiale
Newmark, J.;  Laboratoire d'Astronomie Spatiale
Thompson, B.;  Observatoire Royal de Belgique
Maucherat, A.;  Observatoire Royal de Belgique
Portier-Fozzani, F.;  Observatoire Royal de Belgique
Berghmans, D.;  Observatoire Royal de Belgique
Cugnon, P.
van Dessel, E. L.
Gabryl, J. R.
More authors (23 more) Less
Language :
English
Title :
EIT Observations of the Extreme Ultraviolet Sun
Publication date :
01 October 1997
Journal title :
Solar Physics
ISSN :
0038-0938
Publisher :
Springer Science & Business Media B.V.
Volume :
175
Pages :
571-599
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 07 July 2009

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