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Aeronomy
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Archaea at Midway Geyser Basin in the Grand Prismatic Spring, Yellowstone National Park, Wyoming. Largest hot spring in Yellowstone, third largest in the world. Temp. 147-188F Dim. 250x380 ft. Archaeon, archeon, Yellowstone Geysers, algae
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Aeronomy

atmospheric science
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Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree....
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Aeronomy, study of the physics and chemistry of the upper atmosphere, including the distribution of temperature, density, and chemical constituents, and the chemical reactions that occur. Studies of aurora, airglow, the ionosphere, Van Allen radiation belts, cosmic rays, and radiative and photochemical phenomena exemplify the diverse subjects that properly come under the heading of aeronomy.

This article was most recently revised and updated by John P. Rafferty.