| 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
|
