HR: 0830h
AN: SA41B-0430    [PDF]
TI: FUV Spectroscopy of the Dayglow and Aurora from the TIMED/GUVI Sensor
AU: Wolven, B
EM: Brian.Wolven@jhuapl.edu
AF: Johns Hopkins University Applied Physics Lab, 11100 Johns Hopkins Rd., Laurel, MD 20723 United States
AU: * Morrison, D
EM: daniel.morrison@jhuapl.edu
AF: Johns Hopkins University Applied Physics Lab, 11100 Johns Hopkins Rd., Laurel, MD 20723 United States
AU: Paxton, L
EM: Larry.Paxton@jhuapl.edu
AF: Johns Hopkins University Applied Physics Lab, 11100 Johns Hopkins Rd., Laurel, MD 20723 United States
AU: Zhang, Y
EM: Yongliang.Zhang@jhuapl.edu
AF: Johns Hopkins University Applied Physics Lab, 11100 Johns Hopkins Rd., Laurel, MD 20723 United States
AU: Kil, H
EM: Hyosub.Kil@jhuapl.edu
AF: Johns Hopkins University Applied Physics Lab, 11100 Johns Hopkins Rd., Laurel, MD 20723 United States
AU: Meng, C I
EM: Ching.Meng@jhuapl.edu
AF: Johns Hopkins University Applied Physics Lab, 11100 Johns Hopkins Rd., Laurel, MD 20723 United States
AU: Christensen, A B
EM: andrew.christensen@aero.org
AF: Aerospace Corp., 2350 E. El Segundo Blvd., El Segundo, CA 90245 United States
AB: The Global Ultraviolet Imager (GUVI) on the TIMED spacecraft generates horizon-to-horizon images of the far ultraviolet (FUV) radiance in five bands (HI 121.6 nm, OI 130.4 nm, OI 135.6 m, N$_2$ LBH short 140 - 150 nm, N$_2$ LBH long 165 - 180nm). The GUVI instrument scans cross-track through 127.2$\deg$ producing an orbit swath $\sim$2500 km across on the disk of the Earth. This produces 2-dimensional radiance maps for each orbit. A special spectrograph mode of operation is available on the instrument where the entire spectrum from 115 nm to 180 nm is sent down and the scan mirror is in a fixed (generally nadir pointing) location. In this paper we present an analysis of the nadir dayglow data and nadir aurora data and compare it to the normal imaging mode data from neighboring orbits. In this analysis we will discuss the impact of recent estimations of an enhanced N$_2$ LBH excitation cross section as well as the OI 135.6 nm to N$_2$ LBH ratio and how well the GUVI spectroscopy mode data supports these changes. These cross section changes have implications for the derivation of O / N$_2$ in the dayglow and aurora.
DE: 0310 Airglow and aurora
DE: 0355 Thermosphere--composition and chemistry
DE: 0358 Thermosphere--energy deposition
DE: 0360 Transmission and scattering of radiation
SC: SPA - Aeronomy [SA]
MN: 2003 Fall Meeting