The aeronomic dissociation of water vapor by solar H Lyman-alpha radiation

Details The aeronomic dissociation of water vapor by solar H Lyman-alpha radiation The aeronomic dissociation of water vapor by solar H Lyman-alpha radiation

Jun 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88.4935l&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 88, June 1, 1983, p. 4935-4940.

Physics

43

Aeronomy, Lyman Alpha Radiation, Photodissociation, Radiation Effects, Solar Terrestrial Interactions, Water Vapor, Absorption Cross Sections, Photoabsorption, Rates (Per Time), Vertical Distribution

Scientific paper

The photoabsorption cross sections of molecular oxygen and water vapor have been measured as a function of temperature at 0.1 A intervals between 1214 and 1219 A. Over the width of the solar Lyman-alpha line there is no fine structure apparent in the cross sections which were measured with 0.05 A resolution. A large wavelength and temperature dependence is seen in the molecular oxygen cross sections, but the variations are much smaller in the case of water vapor. The measured cross sections are used in calculations of the rate of photodissociation of atmospheric water vapor by solar Lyman-alpha radiation, taking full account of both the temperature and wavelength dependences. It is found that the photodissociation rates may be accurately reproduced at altitudes above those where Lyman-alpha ceases to dominate the dissociation by using molecular oxygen and water vapor cross sections corresponding to fixed temperatures near 200 K. Analytical models for these cross sections are presented for use in photochemical calculations.

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