This is the Hanzi character 熊 (pinyin xiong2); in English, it means "bear". To the extent that my creation of this instance of a character glyph may have invoked some aspect of copyright law, I release the work into the public domain from whence it came. ...
Found on http://en.wikipedia.org/wiki/Heterosphere
(from the article `protonosphere`) ...the ionosphere. In the lowest part of the Earth`s atmosphere, called the homosphere (100 km [about 65 miles]), turbulence causes a continuous ... ...diffusion of gases. In this region, which occurs below 100 km (about 60 miles) or so, the composition of the atmosphere tends to be independent of ... ...
Found on http://www.britannica.com/eb/a-z/h/45
heterosphere In meteorology, the upper of two portions of the atmosphere as distinguished by the general homogeneity of their composition (the other portion is the homosphere); it begins at 80 to 100 kilometers above the earth, closely coinciding with the ionosphere and the thermosphere, and is characterized by variation in composition and mean mol
Found on http://www.wordinfo.info/words/index/info/view_unit/1999/4
The upper layer in a two part classification of the atmosphere based on the general homogeneity of chemical composition. In this layer, oxygen atoms and nitrogen molecules dominate and remain constant in their relative quantities. The heterosphere extends upward from a height of 80 to 100 kilometers depending on latitude. Below this layer is the ho
Found on http://www.physicalgeography.net/physgeoglos/h.html
The Earth atmosphere above 105 km altitude where species-wise concentration profiles establish due to diffusive equilibrium, with N2 dominance below 200 km, O dominance from 200 to 600 km, and He dominance as of 600 km altitude.
Found on http://www.braeunig.us/space/glossary.htm
No exact match found