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Aeronomy
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<p>Aeronomy is the scientific study of the <a href="/facts/Upper_atmosphere/5yH29VP8">upper atmosphere</a> of the <a href="/facts/Earth/HLLmDfj0">Earth</a> and corresponding regions of the atmospheres of other planets. It is a branch of both <a href="/facts/Atmospheric_chemistry/EbmISm33">atmospheric chemistry</a> and <a href="/facts/Atmospheric_physics/r2eat5II">atmospheric physics</a>. Scientists specializing in aeronomy, known as aeronomers, study the motions and chemical composition and properties of the Earth's upper atmosphere and regions of the atmospheres of other planets that correspond to it, as well as the interaction between upper atmospheres and the <a href="/facts/Outer_space/R3LRKyFs">space</a> environment. In atmospheric regions aeronomers study, <a href="/facts/Dissociation_(chemistry)/gDRGdeSN">chemical dissociation</a> and <a href="/facts/Ionization/W13Ceavd">ionization</a> are important phenomena. </p>