At midnight he and Jutta prowl the ionosphere, searching for that lavish, penetrating voice.
Anthony Doerr -- All the Light We Cannot See
On this particular Thursday, something was moving quietly through the ionosphere many miles above the surface of the planet; several somethings in fact, several dozen huge yellow chunky slablike somethings, huge as office blocks, silent as birds.
Douglas Adams -- The Hitchhiker’s Guide to the Galaxy
The planet’s too primitive to depend on its comm net, the ionosphere’s too weak for shortwave, the comsats are the first things to go in a skirmish… I’d call it by fatline.