Heterosphere

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Heterosphere

</dt>
The upper portion of a two-part division of the atmosphere according to the general homogeneity of atmospheric composition; the layer above the homosphere. The heterosphere is characterized by variation in composition and mean molecular weight of constituent gases. See atmospheric shell. </dd>
This region starts at 80 and 100 kilometers above the earth, and therefore closely coincides with the ionosphere and the thermosphere. [[/a>|/a> ]]

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use