0 the layer of gases surrounding the earth at a height of between 50 and 100 kilometres --
1 the layer of gases surrounding the earth at a height of between 50 and 100 kilometers, above the stratosphere --
In the mesosphere temperature decreases with increasing height.
Atmospheric tides dominate the dynamics of the mesosphere and lower thermosphere.
An orbital, thermosphere, or even mesosphere airship would face many practical and theoretical challenges and would represent a remarkable technical achievement.
The vehicles could support extended research and exploration in the mesosphere and/or thermosphere, which are largely unexplored regions of the atmosphere.
These tides propagate away from the source regions and ascend into the mesosphere and thermosphere.
Satellite observations allow the very coldest parts of the polar mesosphere to be observed, all the way to the geographic pole.
This dissipation deposits momentum into the mesosphere and largely drives global circulation.
Sodium guide stars use laser light at 589 nm to excite sodium atoms in the mesosphere and thermosphere, which then appear to glow.
