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The ionosphere is part of a planet's upper atmosphere that is ionized by radiation from space and consists of a plasma. Ionospheres are characteristic of high electron density and hence high electrical conductivity. The ionosphere affects the radio waves.

The Gamma Site has an atmosphere that has a unique radioactive ionosphere, thus making it difficult to lock on to targets on the surface from orbit. The ionosphere made ​​it problematic for Odyssey to lock onto the SG-1 and IOA delegations' signs of life on the surface after they were attacked by a large number of R-75. (SG1: "The Scourge")

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