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Aeronomy
Aeronomy is the science of the upper region of the atmosphere, where dissociation and ionization are important. The term ''aeronomy'' was introduced by Sydney Chapman in a Letter to the Editor of '' Nature'' entitled ''Some Thoughts on Nomenclature'' in 1946.〔Sydney Chapman, "Some Thoughts on Nomenclature," ''Nature'' 157, (1946): 405. Available on-line at: (''Nature'' ).〕
Today the term also includes the science of the corresponding regions of the atmospheres of other planets. Aeronomy is a branch of atmospheric physics. Research in aeronomy requires access to balloons, satellites, and sounding rockets which provide valuable data about this region of the atmosphere. Atmospheric tides dominate the dynamics of the mesosphere and lower thermosphere. Therefore, understanding of atmospheric tides is essential to understanding the atmosphere as a whole. Other phenomena studied are upper-atmospheric lightning discharges, such as red sprites, sprite halos, blue jets, and elves.
==Atmospheric tides==
(詳細はAtmospheric tides are global-scale periodic oscillations of the atmosphere. In many ways they are analogous to ocean tides. Atmospheric tides form an important mechanism for transporting energy input into the lower atmosphere from the upper atmosphere, while dominating the dynamics of the mesosphere and lower thermosphere. Therefore, understanding the atmospheric tides is essential in understanding the atmosphere as a whole. Modeling and observations of atmospheric tides are needed in order to monitor and predict changes in the Earth's atmosphere.〔Volland, H., "Atmospheric Tidal and Planetary Waves", Kluwer Publ., Dordrecht, 1988〕
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