homogeneous atmosphere

homogeneous atmosphere

[‚hä·mə′jē·nē·əs ′at·mə‚sfir]
(meteorology)
A hypothetical atmosphere in which the density is constant with height.

homogeneous atmosphere

i. A hypothetical atmosphere in which the gaseous composition is constant with height. The lapse rate of temperature in such an atmosphere is known as the autoconvective lapse rate and is equal to approximately 15°F/1000 ft (3.4°C/100 m). For a surface temperature of –32°F (273 K), the vertical extent of the homogeneous atmosphere on the earth is approximately 25,000 ft (8 km). At the top of such an atmosphere both the pressure and absolute temperature vanish.
ii. With respect to radio propagation, an atmosphere that has a constant index of refraction, or one in which radio waves travel in straight lines at a constant speed. Free space is the ideal homogeneous atmosphere in this sense.
iii. The same as adiabatic atmosphere.
homopause The top of the homosphere, or the level of transition between it and the hetrosphere. The homopause probably lies between 50 and 55 miles (80 and 90 km), where molecular oxygen begins to dissociate into atomic oxygen. The homopause is somewhat lower in the daytime than at night. See hetrosphere.
References in periodicals archive ?
The reason for the faster growth is that each culture plate is placed on its own shelf inside the incubator, which provides for a homogeneous atmosphere and efficient thermal conductivity in the incubator to bring the culture plate up to optimal conditions faster.
They also have to fit a certain profile that we require to maintain a homogeneous atmosphere regardless of whether [potential entrants] are Lebanese, workers or foreigners -- it doesn't matter.
That is one of the real puzzles, as to why there was not good mixing or there was not a more homogeneous atmosphere within the meteorologic vortex,' he says.