Updated modeling of the N2 LBH band emissions in the Earth’s thermosphere

Details Updated modeling of the N2 LBH band emissions in the Earth’s thermosphere Updated modeling of the N2 LBH band emissions in the Earth’s thermosphere

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa53a1235e&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SA53A-1235

Other

[0310] Atmospheric Composition And Structure / Airglow And Aurora, [0355] Atmospheric Composition And Structure / Thermosphere: Composition And Chemistry

Scientific paper

Much of the information derived from remote sensing of the thermosphere depends on our understanding of the N2 Lyman-Birge-Hopfield (LBH) band emissions. This emission is essential to techniques used to derive atomic oxygen to molecular nitrogen (O/N2) density ratios, to molecular nitrogen densities and to remotely sensing the temperature of the lower thermosphere. There has been uncertainty and debate about the importance of excitation of the emission by cascade of excitation from other states of N2. Previous modeling results for the LBH band emissions from the Earth’s upper atmosphere have made approximations to either the cascading between the singlet states or the calculation of the photoelectron spectrum. Consequently, direct excitation, scaled to approximate the expected effects of excitation by cascade, is used when deriving information from atmospheric observations. Now, a model of the cascading, Intrasystem Cascade Excitation (ICE), has been coupled with a recent model, GLOW, for calculating the photoelectron spectrum. With this combination of models, the approximations previously used can be avoided. In addition to coupling the two models, the most recent N2 cross section information now available have been incorporated into the calculation. These updated calculation are generally consistent with earlier calculations; however, when the recent cross sections are incorporated, the brightness of the LBH bands is enhanced less than that reported for earlier calculations.

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