Research topic: Orbiting Geophysical Observatory

Orbiting Geophysical Observatory (OGO), series of six orbiting observatories (see observatory, orbiting ) launched between 1964 and 1969 by the National Aeronautics and Space Administration (NASA) to study the earth's atmosphere, ionosphere , and magnetosphere and the solar wind . In order to provide global coverage, three of the satellites (OGO-2, OGO-4, and OGO-6) were launched into low polar orbits while the other three (OGO-1, OGO-3, and OGO-5) were placed in eccentric orbits ranging out as far as almost 92,830 mi (150,000 km). Each observatory carried 20-25 instruments, including... Read more