@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/ff60d0cf-4665-40b6-b375-dd59dba896f9>
  ns0:resource [ ] ;
  ns0:altLabel [ ] ;
  skos:definition """The Orbiting Geophysical Observatory 4 (OGO 4) was a large observatory
instrumented with experiments designed to study the interrelationships between
the aurora and airglow emissions, energetic particle activity, geomagnetic
field variation, ionospheric ionization and recombination, and atmospheric
heating which take place during a period of increased solar activity. After the
spacecraft achieved orbit and the experiments were deployed into an operating
mode, an attitude control problem occurred.  This condition was corrected by
ground control procedures until complete failure of the tape recording systems
in mid-January 1969.  At that time, due to the difficulty of maintaining
attitude control without the tape recorders, the attitude control system was
commanded off, and the spacecraft was placed into a spin-stabilized mode about
the axis which was previously maintained vertically.  In this mode, seven of
the remaining experiments were turned off since no meaningful data could be
observed by them.  On October 23, 1969, the satellite was turned off. It was
reactivated again in January 1970 for 2 months to obtain VLF observations.  

[Summary provided by NASA.]


Group: Platform_Details
   Entry_ID: OGO-4
   Group: Platform_Identification
      Platform_Category: Earth Observation Satellites
      Platform_Series_or_Entity: OGO (Orbiting Geophysical Observatory)
      Short_Name: OGO-4
      Long_Name: Orbiting Geophysical Observatory-4
   End_Group
   Group: Synonymous_Platform_Names
      Short_Name: OGO-D
      Short_Name: POGO 2
      Short_Name: 02895
   End_Group
   Group: Platform_Associated_Instruments
      Short_Name: SPECTROMETERS
      Short_Name: PHOTOMETERS
      Short_Name: PARTICLE DETECTORS
   End_Group
   Group: Orbit
      Orbit_Inclination: 86 degrees
      Period: 98 minutes
      Perigee: 412 km
      Apogee: 908 km
      Orbit_Type: LEO > Low Earth Orbit > Polar Sun-Synchronous
   End_Group
   Creation_Date: 2007-02-13
   Online_Resource: http://nssdc.gsfc.nasa.gov/database/MasterCatalog?sc=1967-073A
   Sample_Image: http://heasarc.gsfc.nasa.gov/Images/ogo/ogo.gif
   Group: Platform_Logistics
      Launch_Date: 1967-07-28
      Launch_Site: Vandenberg Air Force Base, USA
      Primary_Sponsor: NASA
   End_Group
End_Group"""@en ;
  skos:prefLabel "OGO-4"@en ;
  skos:inScheme <https://gcmd.earthdata.nasa.gov/kms/concepts/concept_scheme/platforms> ;
  skos:broader <https://gcmd.earthdata.nasa.gov/kms/concept/e57b586f-09ba-45ad-868c-4c232d6034b4> ;
  a skos:Concept .

<https://gcmd.earthdata.nasa.gov/kms/concept/e57b586f-09ba-45ad-868c-4c232d6034b4>
  skos:prefLabel "OGO (Orbiting Geophysical Observatory)"@en ;
  a skos:Concept ;
  skos:narrower <https://gcmd.earthdata.nasa.gov/kms/concept/ff60d0cf-4665-40b6-b375-dd59dba896f9> .