Molecular Nitrogen Carroll-Yoshino c4' (v'=0, v">2) Fluorescence in the Thermospheric Dayglow as seen by the Far Ultraviolet Spectroscopic Explorer

Details Molecular Nitrogen Carroll-Yoshino c4' (v'=0, v">2) Fluorescence in the Thermospheric Dayglow as seen by the Far Ultraviolet Spectroscopic Explorer Molecular Nitrogen Carroll-Yoshino c4' (v'=0, v">2) Fluorescence in the Thermospheric Dayglow as seen by the Far Ultraviolet Spectroscopic Explorer

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsa41a..12b&link_type=abstract

American Geophysical Union, Spring Meeting 2005, abstract #SA41A-12

Physics

0310 Airglow And Aurora, 0343 Planetary Atmospheres (5405, 5407, 5409, 5704, 5705, 5707), 0355 Thermosphere: Composition And Chemistry, 0358 Thermosphere: Energy Deposition, 0360 Transmission And Scattering Of Radiation

Scientific paper

N2 Carroll-Yoshino c4' excitation has been of considerable interest in the analysis of EUV-FUV observations of several solar system objects: Earth, Titan and Triton. The fundamental v'=0, v"=0 band is characterized by strong transition strengths with relatively weak predissociation. However, the associated large optical depths lead to enhancement of predissociation and fluorescence. Past work on the intricacies of c4' multiple scattering and the interaction of v'=0, v"=1 branching with the b(2,0) transition illustrated the complexities of the problem and provided insight into the differences seen among observed thermospheres; however, the role of v'=0, v">2 fluorescence has until now been considered very minor. High-resolution dayglow measurements by the Far Ultraviolet Spectroscopic Explorer (FUSE) made in September 1999 reveal c4' fluorescence bands at wavelengths > 1100 Å much stronger than previously expected. The results of a careful analysis of the FUSE measurements -- fluorescence band intensities along with intensities of features blended in lower resolution observations -- are presented and the implications of the observed emission ratios are discussed. The c4' (0,9) band at 1183 Å in particular stands out as a viable remote sensing observable.

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