The importance of energetic particle precipitation on the chemical composition of the middle atmosphere

Physics – Geophysics

Scientific paper

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Atmospheric Composition, Chemical Composition, Cosmic Rays, Electron Precipitation, Energetic Particles, Proton Precipitation, Atmospheric Chemistry, Galactic Radiation, Hydrogen Compounds, Ion Production Rates, Nitrogen Oxides, Ozone, Ozone Depletion, Relativistic Particles, Solar Protons, Stratosphere

Scientific paper

The present review deals with the importance of three distinct classes of precipitation which directly deposit energy into the middle atmosphere, viz. galactic cosmic radiation, energetic solar protons and relativistic electron precipitation from the earth's radiation belts. Chemical considerations during particle precipitation are discussed, with special emphasis on the relative production rate of odd nitrogen and odd hydrogen species during ionizing particle precipitation. The long residence time of NO in the upper stratosphere, where catalytic interaction with O3 is most effective, requires that this mechanism be included in future modeling of global distribution of O3. Other situations causing O3 depletion are also identified.

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