The lower portion of the earth's atmosphere, characterized by relatively uniform gaseous composition. Consists of the troposphere, the stratosphere, and the mesosphere.
The lower portion of a two-part division of the atmosphere, the other which includes the heterosphere. The homosphere has no gross change in composition, that is, all of the atmosphere from the earth’s surface to 80 to 100km.
The Earth atmosphere below 105 km altitude where complete vertical mixing yields a near-homogeneous composition of about 78.1% N2, 20.9% O2, 0.9% Ar, and 0.1% CO2 and trace constituents. The homopause (or turbopause) marks the ceiling of the homosphere. The homosphere can be broadly divided into three distinct regimes: the troposphere (0 to 12 km), the stratosphere (12 to 50 km) and the mesosphere (50 to 90 km).
One of two atmospheric layers in a scheme based on the homogeneity of composition. This is the atmospheric layer consisting of a homogeneous mixture of nitrogen, oxygen and argon along with variable concentrations of trace gases. The upper boundary of the homosphere is located at around 80-90 km, above which sits the heterosphere, the other layer in this two-layer scheme. This is also called the neutral atmosphere.
The region of the atmosphere below about 85km where the composition of air remains fairly constant.
The lower part of the atmosphere, in which the gases have stirred into a homogenous mixture.