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Upper atmospheric region where molecular diffusion dominates
The heterosphere is the layer of an atmosphere where gases are separated out by molecular diffusion with increasing altitude such that lighter species
Heterosphere
Gas layer surrounding Earth
gradually yields to molecular diffusion. The latter process forms the heterosphere where the relative concentration of lighter gases increase with altitude
Atmosphere_of_Earth
Chemical element with atomic number 2 (He)
Earth's atmosphere escapes into space by several processes. In the Earth's heterosphere, a part of the upper atmosphere, helium and hydrogen are the most abundant
Helium
Layer of an atmosphere where the bulk gases are homogeneously mixed
homopause, also known as the turbopause. Above the homopause is the heterosphere, where diffusion is faster than mixing, and heavy gases decrease in density
Homosphere
Layer in ionosphere
thermosphere, a hot region in the upper atmosphere, and also in the heterosphere, where chemical composition varies with height. Generally speaking, the
F_region
Conventional definition of the edge of space
Armstrong limit – Altitude above which water boils at body temperature Heterosphere – Upper atmospheric region where molecular diffusion dominates "Airglow
Kármán_line
Living and non-living things on Earth
homosphere and heterosphere: The homosphere includes the troposphere, stratosphere and mesosphere. The upper part of the heterosphere is composed almost
Natural_environment
Altitude in the Earth's atmosphere below which turbulent mixing dominates
more homogeneous concentrations. The region above the turbopause is the heterosphere, where molecular diffusion dominates and the chemical composition of
Turbopause
Planetary atmospheric layer
dominates in the outermost layers because it is the lightest gas, and in the heterosphere, mixing is not strong enough to overcome differences in constituent gas
Protonosphere
Overview of and topical guide to Earth science
directly influenced by contact with the planetary surface By air turbulence Heterosphere – Upper parts of the atmosphere in which the component gases are not
Outline_of_Earth_science
Escape of gases from the atmosphere
leaving only H and H2 behind. The H and H2 diffuse upward through the heterosphere to the exobase where they escape the atmosphere by Jeans thermal escape
Diffusion-limited_escape
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