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

<https://gcmd.earthdata.nasa.gov/kms/concept/5057855a-7e45-47d8-ae4b-92b9c63a3deb>
  ns0:resource [ ] ;
  ns0:altLabel [ ] ;
  skos:definition """SOFIE is one of three instruments onboard the Aeronomy of Ice in the Mesosphere (AIM) satellite. The objective of AIM is to study polar mesospheric clouds (PMCs) and the environment in which they form.

SOFIE uses the technique of solar occultation to measure solar energy passing through the limb of the earth's atmosphere as the sun rises or sets relative to the spacecraft. These measurements are accomplished using differential absorption radiometry with eight band pairs covering wavelengths from 0.29 to 5.26 microns. Six SOFIE channels are designed to measure gaseous signals, and two are dedicated to PMC measurements.  Measurements in two carbon dioxide bands will be used to simultaneously retrieve profiles of temperature and carbon dioxide mixing ratio. Each SOFIE channel uses two detectors, one that samples a spectral region where the target gas is strongly absorbing, and one that samples a weakly absorbing region. Measuring the difference of these signals allows precise isolation of the target gas signal and reduces common-mode noise. The measurements allow PMC extinction retrievals using the gas channel weak bands, so that PMCs will be measured at a total of 11 wavelengths. 

[Text Source: GATS Inc. SOFIE Instrument Home Page, http://gwest.gats-inc.com/sofie/SOFIE_Home_Page.html]


Group: Instrument_Details
   Entry_ID: SOFIE
   Group: Instrument_Identification
      Instrument_Category: Earth Remote Sensing Instruments
      Instrument_Class: Passive Remote Sensing
      Instrument_Type: Spectrometers/Radiometers
      Instrument_Subtype: Spectrometers
      Short_Name: SOFIE
      Long_Name: Solar Occultation for Ice Experiment
   End_Group
   Group: Associated_Platforms
      Short_Name: AIM
   End_Group
   Group: Spectral_Frequency_Information
      Wavelength_Keyword: Microwave
      Number_Channels: 8
      Spectral_Frequency_Coverage_Range: 0.292 to 5.316 micrometers
   End_Group
   Online_Resource: http://gwest.gats-inc.com/sofie/SOFIE_Home_Page.html
   Online_Resource: http://sofie.gats-inc.com/sofie/index.php
   Online_Resource: http://aim.hamptonu.edu/instrmt/sofie.html
   Sample_Image: http://aim.hamptonu.edu/graphics/gallery/lg/instruments/sofie/sofie_sat.png
   Creation_Date: 2008-01-22
   Group: Instrument_Logistics
      Instrument_Owner: NASA
   End_Group
End_Group"""@en ;
  skos:prefLabel "SOFIE"@en ;
  skos:inScheme <https://gcmd.earthdata.nasa.gov/kms/concepts/concept_scheme/instruments> ;
  skos:broader <https://gcmd.earthdata.nasa.gov/kms/concept/055a79c7-61db-4250-abad-f1e09909f14c> ;
  a skos:Concept .

<https://gcmd.earthdata.nasa.gov/kms/concept/055a79c7-61db-4250-abad-f1e09909f14c>
  skos:prefLabel "Spectrometers"@en ;
  a skos:Concept ;
  skos:narrower <https://gcmd.earthdata.nasa.gov/kms/concept/5057855a-7e45-47d8-ae4b-92b9c63a3deb> .