@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/eb12ba15-e041-49de-b804-9dd4d56910ab>
  ns0:altLabel [ ] ;
  skos:definition """The objective of the Atmospheric Emissions Photometric Imaging (AEPI)
experiment was the investigation of the upper atmosphere-ionosphere
and the space shuttle environment. The AEPI experiment was flown on
the Space Shuttle as part of the Atmospheric Laboratory for
Applications and Science (ATLAS 1). The goals of this experiment were
(1) investigation of ionospheric transport processes by observing
positive magnesium (Mg) ions, (2) studies of optical properties of
artificially induced electron beams, (3) measurement of electron cross
sections for selected atmospheric species, (4) studies of natural
airglow, and (5) studies of natural auroras. Many experiments were
performed with the AEPI instrument in coordination with other ATLAS 1
instruments (ISO and SEPAC). The experiment also investigated optical
emissions generated by the Shuttle. The equipment consists of (1) a
dual-channel low-light-level television (LLLTV) system, photon
counting array and associated electronics, (2) a low-light-level
unfiltered (spectral continuum) TV camera which consists of an
Augeniux 50 mm f/0.95 lens focused at infinity whereby an image is
formed on a single-stage microchannel plate intensified inverter tube
coupled to an uncooled CCD via a fiberoptic taper, (3) dedicated
experiment processor (DEP) which controls the detector functions
including filter wheel positioning, camera focusing, prism movement,
intensifier gain control, and gain control, (4) a small hand-held
image intensifier and associated filters and manually operated
spectrometer which can be used by the payload crew to monitor
low-light-level phenomena, and (5) a video data encoder (VDE) for
annotating video with essential housekeeping and experiment
parameters. The magnesium positive ion resonance line is imaged at
279.5 and 280.2 nm and the 2p state singly ionized atomic oxygen is
obtained at 731.9 and 247.0 nm.
Further information about the ATLAS-1 mission can be found at:
"http://wwwghcc.msfc.nasa.gov/atlas1.html"
IDN_Node: USA/NASA"""@en ;
  skos:prefLabel "AEPI"@en ;
  skos:inScheme <https://gcmd.earthdata.nasa.gov/kms/concepts/concept_scheme/instruments> ;
  skos:broader <https://gcmd.earthdata.nasa.gov/kms/concept/f66daf4f-4d71-49a0-9d3d-205dc7f1faed> ;
  a skos:Concept .

<https://gcmd.earthdata.nasa.gov/kms/concept/f66daf4f-4d71-49a0-9d3d-205dc7f1faed>
  skos:prefLabel "Photometers"@en ;
  a skos:Concept ;
  skos:narrower <https://gcmd.earthdata.nasa.gov/kms/concept/eb12ba15-e041-49de-b804-9dd4d56910ab> .