HR: 0830h
AN: SA41A-12 [Abstracts]
TI: Molecular Nitrogen Carroll-Yoshino c4' (v'=0, v">2) Fluorescence in the Thermospheric Dayglow as seen by the Far Ultraviolet Spectroscopic Explorer
AU: * Bishop, J
EM: jbishop@uap2.nrl.navy.mil
AF: Code 7641
E.O. Hulburt Center for Space Research, Naval Research Laboratory, Washington, DC 20375 United States
AU: Stevens, M H
EM: stevens@uap2.nrl.navy.mil
AF: Code 7641
E.O. Hulburt Center for Space Research, Naval Research Laboratory, Washington, DC 20375 United States
AU: Feldman, P D
EM: pdf@pha.jhu.edu
AF: Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218 United States
AB:
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.
DE: 0310 Airglow and aurora
DE: 0343 Planetary atmospheres (5405, 5407, 5409, 5704, 5705, 5707)
DE: 0355 Thermosphere--composition and chemistry
DE: 0358 Thermosphere--energy deposition
DE: 0360 Transmission and scattering of radiation
SC: SPA-Aeronomy [SA]
MN: 2005 Joint Assembly