Explorer 4
| Explorer 4 | ||||||||||
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| Country: |
 United States
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| Operator: | Army Ballistic Missile Agency | |||||||||
| COSPAR-ID : | 1958-005A | |||||||||
| Mission dates | ||||||||||
| Dimensions: | 25.5 kg | |||||||||
| Begin: | July 26, 1958 | |||||||||
| Starting place: | Cape Canaveral | |||||||||
| Launcher: | Juno I | |||||||||
| Flight duration: | 454 days | |||||||||
| Status: | burned up | |||||||||
| Orbit data | ||||||||||
| Rotation time : | 110.2 min | |||||||||
| Orbit inclination : | 50.3 ° | |||||||||
| Apogee height : | 2213 km | |||||||||
| Perigee height : | 263 km | |||||||||
| Eccentricity : | 0.1279 | |||||||||
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Explorer 4 was a satellite of the Explorer program of NASA , the July 26, 1958 by a Juno I was brought rocket into orbit. James Van Allen's working group equipped the satellite with measuring instruments that enabled detailed measurements of charged particles ( protons and electrons ) in the Earth's magnetic field. The Defense Advanced Research Projects Agency (DARPA) of the US Department of Defense used this satellite to study the Van Allen Belt and the effects of nuclear explosions on the belt and the Earth's magnetosphere . The telemetry of the satellite analyzed the three atomic bomb tests as part of Operation Argus . The mission was kept secret from the public for six months.
The interpretation of the data was made difficult by unexpected spin movements of the satellite. It sent its last signals on October 5, 1958, probably due to battery fatigue. After 454 days in orbit, it was released into the atmosphere on October 23, 1959 .
Web links
Individual evidence
- ↑ Information on the Charged Particle Detector experiment
- ↑ Herlihy, Ed (Narrator). Project Argus - “Greatest Experiment”: 3 A-Blasts In Space [video]. Universal International News. September 9, 2012. 29s. "" To monitor the radiation shell in outer space, the satellite Explorer 4 was launched. And all of this in a secrecy not broken for six months. ""
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