upper atmosphere

noun Meteorology.
the portion of the atmosphere above the troposphere.
Compare upper air.


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World English Dictionary
upper atmosphere
meteorol that part of the atmosphere above the troposphere

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American Heritage
Science Dictionary
upper atmosphere  
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The charged particles are accelerated to high energies and stream into the
  upper atmosphere.
The deep ocean, of course, is every bit as unexplored and little understood as
  the upper atmosphere.
As he travelled, he set up instruments called magnetometers to measure electric
  currents in the upper atmosphere.
Some, however, are the result of collisions between cosmic rays and the gases
  of the upper atmosphere.
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