@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix ns0: <http://gcmd.gsfc.nasa.gov/kms#> .

<https://gcmd.earthdata.nasa.gov/kms/concept/b5e4912d-3224-4d7b-924c-a697677775c6>
  skos:prefLabel "Ultraviolet Instruments"@en ;
  a skos:Concept ;
  skos:narrower <https://gcmd.earthdata.nasa.gov/kms/concept/94e64b07-2c6e-4437-bcb3-91c329eb9b8f> .

<https://gcmd.earthdata.nasa.gov/kms/concept/94e64b07-2c6e-4437-bcb3-91c329eb9b8f>
  ns0:resource [ ] ;
  ns0:altLabel [ ] ;
  skos:definition """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
http://umbra.nascom.nasa.gov/eit/images/instrument_paper.pdf

For more information,see:
http://umbra.nascom.nasa.gov/eit/


Group: Instrument_Details
   Entry_ID: EIT
   Group: Instrument_Identification
      Instrument_Category: Solar/Space Observing Instruments
      Instrument_Class: Ultraviolet Instruments
      Short_Name: EIT
      Long_Name: Extreme Ultraviolet Imaging Telescope
   End_Group
   Group: Associated_Platforms
      Short_Name: SOHO
   End_Group
   Group: Spectral_Frequency_Information
      Wavelength_Keyword: Ultraviolet
      Number_Channels: 4
      Spectral_Frequency_Coverage_Range: 17.1 - 30.4 nm
      Spectral_Frequency_Resolution: 2.5 arcsec
   End_Group
   Online_Resource: http://umbra.nascom.nasa.gov/eit/EIT.html#INSTRUMENT
   Sample_Image: http://umbra.nascom.nasa.gov/eit/images/EIT_instrument.gif
   Group: Instrument_Logistics
      Instrument_Start_Date: 1995-12-02
      Instrument_Owner: NASA/GSFC
   End_Group
End_Group"""@en ;
  skos:prefLabel "EIT"@en ;
  skos:inScheme <https://gcmd.earthdata.nasa.gov/kms/concepts/concept_scheme/instruments> ;
  skos:broader <https://gcmd.earthdata.nasa.gov/kms/concept/b5e4912d-3224-4d7b-924c-a697677775c6> ;
  a skos:Concept .