Lyman-Birge-Hopfield Band Observations from ARGOS: Vibrational Populations and Their Altitude Dependence

Details Lyman-Birge-Hopfield Band Observations from ARGOS: Vibrational Populations and Their Altitude Dependence Lyman-Birge-Hopfield Band Observations from ARGOS: Vibrational Populations and Their Altitude Dependence

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsa12a1083e&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SA12A-1083

Physics

0310 Airglow And Aurora, 0350 Pressure, Density, And Temperature, 0355 Thermosphere: Composition And Chemistry, 0358 Thermosphere: Energy Deposition, 0394 Instruments And Techniques

Scientific paper

The N2 Lyman-Birge-Hopfield (LBH) bands (a-X transition) extend throughout the Earth's far-ultraviolet spectrum in the dayglow and aurora. LBH band emissions are important for remote sensing of the Earth's thermosphere, used in both limb-scanning techniques that retrieve N2 and O2 densities and in nadir-viewing techniques for retrieving the O/N2 column density ratios. There is significant uncertainty in modeling the LBH emissions, yet reliable interpretation of remote sensing data depends on the ability to accurately model the emissions. Over the years a wide variety of a-state vibrational population distributions have been inferred from different remote sensing experiments. We present the vibrational population distributions from ultraviolet spectra collected by the High resolution Ionospheric and Thermospheric Spectrograph (HITS) aboard the Advanced Research and Global Observation Satellite (ARGOS). These high spectral resolution (~.2 nm) limb-scan data exhibit brighter emissions from the lower vibrational levels than would be expected from traditional models. The altitude- and latitude-resolved vibrational populations provide clues to the N2 singlet excitation and cascade mechanisms that are key to correct interpretation of LBH observations.

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