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The latter region is known as the heterosphere and is characterized also by the
presence of light atoms, such as helium and hydrogen, at its higher altitudes. A
relative increase of these light elements in comparison with heavier elements
Review of the data obtained from the drag on artificial satellites makes it evident
that the density of the heterosphere is subject to considerable variations (Figure 5
). Whereas at the maximum of solar activity that occurred in 1958 the density ...
Such escape can occur only at the top of the atmosphere by a transport process
taking place in the homosphere and the heterosphere. The equations of diffusion
reveal that the escape of 1,000,000 atoms of helium per square centimetre per ...
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This is the 198215th Edition, in two halves, with the Macropaedia and the Micropaedia. First published in 1768, the publisher is the oldest English-language encyclopedia still in print. Two Scottish ... Read full review