upper atmosphere

noun

, Meteorology.

1. the portion of the atmosphere above the troposphere.

upper atmosphere

noun

1. meteorol that part of the atmosphere above the troposphere

upper atmosphere

1. The part of the atmosphere above the troposphere. The upper atmosphere includes the mesosphere, the ionosphere, the thermosphere, and the exosphere. Temperatures in the upper atmosphere decrease with increasing altitude except in the thermosphere, where temperatures increase significantly with altitude, because the few molecules present receive intense solar radiation.

Word History and Origins

Origin of upper atmosphere¹

First recorded in 1890–95

Example Sentences

Second, the upper atmosphere of Eisberg was pretty much pure hydrogen, which is somewhat easier to ionize than oxygen or nitrogen.

From Project Gutenberg

Clear and dry though the air is, the blue of the skies is pale owing to a light dust haze in the upper atmosphere.

From Project Gutenberg

Or had the Throgs tried to blast the Terran ship in the upper atmosphere, crippling it, making this a forced landing?

From Project Gutenberg

As the cooling progressed, however, the steam that was in the upper atmosphere began to condense and to fall in rain.

From Project Gutenberg

The mists had rolled away from the ground, and only the upper atmosphere remained fog-charged.

From Project Gutenberg