FUV Spectroscopy of the Dayglow and Aurora from the TIMED/GUVI Sensor

Details FUV Spectroscopy of the Dayglow and Aurora from the TIMED/GUVI Sensor FUV Spectroscopy of the Dayglow and Aurora from the TIMED/GUVI Sensor

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsa41b0430w&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SA41B-0430

Physics

0310 Airglow And Aurora, 0355 Thermosphere: Composition And Chemistry, 0358 Thermosphere: Energy Deposition, 0360 Transmission And Scattering Of Radiation

Scientific paper

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, N2 LBH short 140 - 150 nm, N2 LBH long 165 - 180nm). The GUVI instrument scans cross-track through 127.2° producing an orbit swath ˜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 N2 LBH excitation cross section as well as the OI 135.6 nm to N2 LBH ratio and how well the GUVI spectroscopy mode data supports these changes. These cross section changes have implications for the derivation of O / N2 in the dayglow and aurora.

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