Lyman-Birge-Hopfield Studies from Ultraviolet Experiments: Comparing Anomalous Vibrational Populations to Scale-height and Rotational Temperatures and Solar and Geomagnetic Activity

Details Lyman-Birge-Hopfield Studies from Ultraviolet Experiments: Comparing Anomalous Vibrational Populations to Scale-height and Rotational Temperatures and Solar and Geomagnetic Activity Lyman-Birge-Hopfield Studies from Ultraviolet Experiments: Comparing Anomalous Vibrational Populations to Scale-height and Rotational Temperatures and Solar and Geomagnetic Activity

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsa52a0377b&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SA52A-0377

Physics

0310 Airglow And Aurora, 0350 Pressure, Density, And Temperature, 0355 Thermosphere: Composition And Chemistry, 0394 Instruments And Techniques

Scientific paper

The N2 a-X Lyman-Birge-Hopfield (LBH) bands are a prominent emission system extending throughout the far-ultraviolet spectrum which is produced in the Earth's dayglow and aurora. These molecular bands have long been used as a workhorse for characterizing the state of the thermosphere, both in limb-scanning techniques that retrieve N2 and O2 densities and in nadir-viewing methods that interpret the O/N2 column ratios. Over the years a wide variety of a-state vibrational population distributions have been inferred from a number of remote sensing experiments. Our uniform analysis of N2 LBH dayglow spectra from multiple UV sensors found a variety of non-Franck-Condon vibrational populations in the dayglow suggesting differing cascade contributions to LBH. We present the vibrational population distributions from ultraviolet spectra collected by several sensors aboard the Advanced Research and Global Observation Satellite, including new seen high spectral resolution limb-scan data in several passbands. The altitude- and latitude-resolved vibrational populations provide clues to the N2 singlet excitation and cascade mechanisms that are key to correct interpretation of observations that rely on LBH.

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