Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997georl..24.2659c&link_type=abstract
Geophysical Research Letters, Volume 24, Issue 21, p. 2659-2662
Astronomy and Astrophysics
Astrophysics
12
Atmospheric Composition And Structure, Atmospheric Composition And Structure: Middle Atmosphere-Composition And Chemistry, Atmospheric Composition And Structure: Transmission And Scattering Of Radiation, Solar Physics, Astrophysics, And Astronomy: Solar Irradiance
Scientific paper
The absorption of the solar Lyman-alpha line by the terrestrial atmosphere is calculated, taking in account the wavelength variations of the emission line and of the O2 cross-section, as well as the temperature dependence of the cross-section. A new parameterization is developed to reproduce in atmospheric models the results of this high-resolution calculation, up to an attenuation of 1010 for the incident solar radiation. The error made in most of existing models when computing the Lyman-alpha contribution to photodissociation rates in the middle atmosphere, using a constant O2 cross-section of 10-20cm2, is shown to be important and this can affect the loss rate of mesospheric constituents such as H2O or CH4.
Chabrillat Simon
Kockarts Gaston
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