The solar spectral irradiance and its action in the atmospheric photodissociation processes

Physics

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Atmospheric Chemistry, Molecular Absorption, Oxygen Spectra, Ozone, Photodissociation, Solar Radiation, Solar Terrestrial Interactions, Atomic Excitations, Herzberg Bands, Lyman Alpha Radiation, Schumann-Runge Bands, Solar Activity Effects

Scientific paper

A critical analysis is made of solar irradiance in the spectral region covering wavelengths from 100 nm upwards; the absorption characteristics of oxygen and ozone molecules are considered, and the results are applied to atmospheric photochemistry. The absorption of radiation by oxygen and ozone molecules results in their photodissociation both in the homosphere, and makes possible the penetration of solar radiation from the thermosphere, through the mesosphere and stratosphere, down to the troposphere. Special attention is given to Lyman-alpha radiation at 121.6 nm, the O2 Schumann-Runge continuum at wavelengths less than 175 nm, the O2 Schumann-Runge band system from 200 to 175 nm, and the O2 Herzberg continuum at 242.4 nm. For absorption by ozone, the solar spectrum is analyzed in the Hartley band at wavelengths less than 310 nm, the Huggins bands at wavelengths above 310 nm, and the visible Chappuis bands. Finally, for the photodissociation of O3, consideration is given to the transition region (300-320 nm) in which there is a change-over from the production of the excited atom to that of the atom in its ground state.

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