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Memory Beta, non-canon Star Trek Wiki
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The ionosphere is one of the highest zones in a planet’s atmosphere, so named because of the ionisation caused to it by solar radiation.

The planet Rajatha Prime featured a unique ionosphere which prevented accurate sensor scans being taken from orbit, because of this the ruins of a Rajathan city remained undiscovered on the planet for some two millennia. (TNG comic: "Captain's Pleasure")

The atmosphere of the planetoid Darien 224 caused ionospheric bounce, which coupled with bifurcated relays made communications to the planetoid's surface difficult. (EV comic: "Cloak and Dagger")

In 2375, during the final battle of the Dominion War, the USS Defiant fired its weapons on a Breen battlecruiser that had entered the ionosphere of Cardassia. (DS9 novelization: What You Leave Behind)

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