The Polar Orbiting Geophysical Observatories (POGO) were the low altitude half of the Orbiting Geophysical Observatories (OGO) intended to carry a large number of instruments to observe the physical environment of the Earth's magnetosphere and outer ionosphere (Jackson and Vette, 1975). The characteristics of the three POGO spacecraft are shown in Table P1 and the spacecraft design is shown in Figure P49. The magnetometers were each a pair of optically pumped rubidium vapor units whose output signal strength had a sin θ cos θ dependence, where θ is the angle between the optical axis and the observed magnetic field vector (Farthing and Folz, 1967). Each then had equatorial and polar “null zones” relative to their optical axes where the signals were too weak to measure. The equatorial ones were less than 7° half angle, and the polar zones less than 15°. The two instruments were mounted with their optical axes at 55° to each other so the combined output signal was available except for...
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Cain, J.C. (2007). POGO (OGO‐2, ‐4 and ‐6 Spacecraft). In: Gubbins, D., Herrero-Bervera, E. (eds) Encyclopedia of Geomagnetism and Paleomagnetism. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-4423-6_264
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