ionosphere

n.

1.

the outer region of the earth's atmosphere, beyond which is the exosphere; it contains a high concentration of free electrons and ions, and extends from about 50 miles to about 250 miles above the earth's surface, but the height shows daily and seasonal variation, and the composition of the particles in the ionosphere is also affected by events such as solar flares.

Noun

1.

ionosphere - the outer region of the Earth's atmosphere; contains a high concentration of free electrons

Appleton layer, CAT, F layer, Heaviside-Kennelly layer, Van Allen belt, aerospace, aerosphere, air hole, air pocket, airspace, belt, bump, ceiling, chemosphere, crosswind, empty space, favorable wind, fog, front, head wind, high-pressure area, hole, isothermal region, jetstream, layer, low-pressure area, lower atmosphere, outer atmosphere, overcast, photosphere, pocket, roughness, soup, space, stratosphere, stratum, substratosphere, tail wind, tropopause, troposphere, trough, turbulence, upper atmosphere, visibility, visibility zero