Thermopause A zone approximately 300 mi. in altitude that serves conceptually as the top of the atmosphere; an altitude used for the determination of the solar constant.
It has practical importance because, among other functions, it influences radio propagation to distant places on the Earth. It is located in the thermosphere and is responsible for auroras.
thermopause boundary ...
 See also: Equator, Trace, Force, Heat, Ozone
  
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