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aeronomy (s) (noun) (no pl)
The science is about the physics and chemistry of the upper atmosphere; especially in regions of ionized gas: Aeronomy
is the scientific study of the very high atmospheric regions of the Earth and other planets where the ionization of gas takes place.
Aeronomy is also concerned with the atmospheres around comets and satellites, or any other atmosphere where ionization, particularly of oxygen, takes place.
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The study of the physics and chemistry of the upper atmospheres of planetary bodies, including he earth.
Atmospheric differences within the solar system often reflect the planet's or satellite's distance from the sun, the initial evolution of the planet, and the chemical reactions between the planet's air and its rocks.