The ionosphere is one of the highest zones of a planet's atmosphere, so named because the gas molecules are ionized by solar radiation.

In 1996, Henry Starling entered Earth's upper ionosphere in the timeship Aeon. (VOY: "Future's End, Part II")

In 2367, Lieutenant Paul Hickman's type 7 shuttlecraft exploded in the lower ionosphere of Tarchannen III when he tried to land the shuttle on the planet surface. (TNG: "Identity Crisis")

Not long after, a shuttlecraft containing William Riker and Ambassador Odan was fired upon as it prepared to enter the upper ionosphere of Peliar Zel. (TNG: "The Host")

In 2368, the Tamarians created a particle scattering field over El-Adrel IV's ionosphere, so the USS Enterprise-D would not be able to beam up Jean-Luc Picard. (TNG: "Darmok")

In 2371, the Enterprise-D was unable to scan the surface of Veridian III to locate Captain Jean-Luc Picard with its sensors as the planet's ionosphere created too much interference. (Star Trek Generations)

The ionosphere of the Drayans' crysata moon contains high levels of electrodynamic turbulence, which caused a Type 6 shuttlecraft from the USS Voyager to crash in 2372. (VOY: "Innocence")

In 2375, Captain Kathryn Janeway ordered Voyager into a high orbit above a class 6 gas giant to avoid ionospheric turbulence. (VOY: "Extreme Risk") The ionosphere is a region of the upper atmosphere, from about 85 km (53 mi) to 600 km (370 mi) altitude, and includes the thermosphere and parts of the mesosphere and exosphere. It is distinguished because it is ionized by solar radiation. It plays an important part in atmospheric electricity and forms the inner edge of the magnetosphere. It has practical importance because, among other functions, it influences radio propagation to distant places on the Earth

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