EIT: Extreme-Ultraviolet Imaging Telescope for the Soho Mission

The Extreme-ultraviolet Imaging Telescope (EIT) will provide wide-field images of the corona and transition region on the solar disc and up to 1.5 R above the solar limb. Its normal incidence multilayer-coated optics will select spectral emission lines from Fe IX (171 A), Fe XII (195 A), Fe XV (284...

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Bibliographic Details
Main Authors: Delaboudiniere, J -P, Artzner, G E, Brunaud, J, Gabriel, A H, Hochedez, J F, Millier, F, Song, X Y, Au, B, Dere, K P, Howard, R A, Kreplin, R, Michels, D J, Moses, J D, Defise, J M, Jamar, C, Rochus, P, Chauvineau, J P, Marioge, J P, Catura, R C, Lemen, J R
Format: Report
Language:English
Subjects:
AREA COVERAGE
ATMOSPHERES
CORONAS
EIT(EXTREME-ULTRAVIOLET IMAGING TELESCOPE)
GLOBAL
SOLAR X-RAYS
SPECTRAL EMITTANCE
SPECTRAL LINES
TELESCOPES
TEMPERATURE
TRANSITIONS
Ultraviolet Detection and Detectors
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Summary:The Extreme-ultraviolet Imaging Telescope (EIT) will provide wide-field images of the corona and transition region on the solar disc and up to 1.5 R above the solar limb. Its normal incidence multilayer-coated optics will select spectral emission lines from Fe IX (171 A), Fe XII (195 A), Fe XV (284 A), and He II (304 A) to provide sensitive temperature diagnostics in the range from 6 104 K to 3 106 K. The telescope has a 4545 arcmin eld of view and 2.6 arcsec pixels which will provide approximately 5-arcsec spatial resolution. The EIT will probe the coronal plasma on a global scale, as well as the underlying cooler and turbulent atmosphere, providing the basis for comparative analyses with observations from both the ground and other SOHO instruments. This paper presents details of the EIT instrumentation, its performance and operating modes. Supported in part by contract NAS5-32627.