- 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.
Aviation dictionary. 2014.
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