Aeronomy is the research area focused on the physical and chemical processes governing the upper atmospheres of planets, including Earth, typically from the mesosphere upward through the thermosphere, ionosphere, and exosphere. It examines energy inputs from solar radiation, charged particles, and magnetospheric coupling, and their roles in driving ionization, excitation, heating, and atmospheric escape. Aeronomy integrates fluid dynamics, plasma physics, radiative transfer, and atmospheric chemistry to model composition, temperature, density, and ionization structure. The field underpins understanding of space weather impacts, ionospheric variability, atmospheric coupling across altitudes, and comparative aeronomy of other planetary bodies and exoplanets.
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