@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/4190ebdc-e89a-4f3f-bc74-b2af4c68d009>
  skos:prefLabel "Profilers/Sounders"@en ;
  a skos:Concept ;
  skos:narrower <https://gcmd.earthdata.nasa.gov/kms/concept/c4ed5cfc-b7c3-4a6f-822c-35e81a39cc0e> .

<https://gcmd.earthdata.nasa.gov/kms/concept/c4ed5cfc-b7c3-4a6f-822c-35e81a39cc0e>
  ns0:altLabel [ ] ;
  skos:definition """The objective of the Millimeter Wave Atmospheric Sounder (MAS)
experiment on Atmospheric Laboratory for Application and Science
(ATLAS) was to study the composition and dynamic structure of the
stratosphere, mesosphere, and lower thermosphere in the 20 to 90 km
altitude range (middle atmosphere) with a height resolution as low as
4 km.  MAS provided simultaneous information on the temperature and
ozone distribution in the 20 to 90 km region and information on water
vapor and chlorine monoxide (ClO). The MAS is a passive limb-sounding
total power microwave radiometer-spectrometer. The equipment consists
of a steerable parabolic antenna which focuses the radiation into the
MAS Reciever Electronics (MRE). The MRE consists of three radiometers
operating at frequencies 61 to 64 GHz, 183 GHz and 204 GHz. The
signals are converted to intermediate frequencies below 6 GHz which
are then analyzed by five filterbanks in the Filter Electronic Box
(FEB) which consists of 240 filters.  The antenna can position in
elevation about 4 degrees with a total scan of about 13 degrees. The
instrument is expected to be flown on subsequent ATLAS missions. The
MAS on ATLAS provided critical correlative measurements with the
Microwave Limb Sounder (MLS) and other instruments on the Upper
Atmosphere Research Satellite (UARS).  MAS was flown on all three
ATLAS missions.
See Croskey, et al,"The Milimeter Wave Atmospheric Sounder (MAS): A
Shuttle-Based Remote Sensing Experiment",IEEE Trans.  Microwave Theory
and Techniques, Vol. 40, No. 6, June 1992, pp. 1090-1100.
For more information on MAS and online MAS images see:
"http://auc.dfd.dlr.de/MAS/\""""@en ;
  skos:prefLabel "MAS/ATLAS"@en ;
  skos:inScheme <https://gcmd.earthdata.nasa.gov/kms/concepts/concept_scheme/instruments> ;
  skos:broader <https://gcmd.earthdata.nasa.gov/kms/concept/4190ebdc-e89a-4f3f-bc74-b2af4c68d009> ;
  a skos:Concept .