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Instrument: EIT : Extreme Ultraviolet Imaging Telescope
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Associated Platforms

Spectral/Frequency Information
Wavelength Keyword: Ultraviolet
Number Channels: 4
Spectral/Frequency Coverage/Range: 17.1 - 30.4 nm
Spectral/Frequency Resolution: 2.5 arcsec

Related Data Sets
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The Extreme Ultraviolet Imaging Telescope (EIT) on the Solar Heliospheric
Observatory (SOHO) is a normal-incidence, multilayer telescope. The EIT is a
telescope of Ritchey-Chretien design that will obtain full-disk images in four
narrow passbands with a eld of view 45 arcmin square and a spatial resolution
limited only by the 2.6 arcsec pixel size of the CCD image sensor. The EIT uses
four separate multilayers that are deposited on matched quadrants of both the
primary and secondary mirrors of the telescope. The bandpasses are defined
through interference effects arising in the multilayer coatings. A rotating
mask allows only a single multilayer-coated quadrant of the telescope to be
illuminated by the Sun at any time. All of the multilayers are fabricated from
alternating layers of molybdenum and silicon.

A paper describing the instrument (Delaboudinere et al. 1996, Solar Physics
162, 291) is available

For more information,see:

Online Resources

Instrument Logistics
Instrument Start Date: 1995-12-02
Instrument Owner: NASA/GSFC