Dayside Disk Measurements of Thermospheric Atomic Oxygen Emissions at High Spectral Resolution: Preliminary Analysis of FUSE Data

Details Dayside Disk Measurements of Thermospheric Atomic Oxygen Emissions at High Spectral Resolution: Preliminary Analysis of FUSE Data Dayside Disk Measurements of Thermospheric Atomic Oxygen Emissions at High Spectral Resolution: Preliminary Analysis of FUSE Data

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsa32a..04b&link_type=abstract

American Geophysical Union, Spring Meeting 2002, abstract #SA32A-04

Physics

0310 Airglow And Aurora, 0358 Thermosphere: Energy Deposition

Scientific paper

Several sets of dayside disk spectral measurements have been performed with the Far Ultraviolet Spectroscopic Explorer (FUSE) to date. These data, covering the spectral interval 905--1184~Å with unprecedented spectral resolution in airglow studies, capture a number of terrestrial thermosphere emission features, the intensities and distributions of which remain contended in part owing to instrumental limitations in past datasets. A dayside disk spectral atlas using the medium-resolution ( ~ 0.05 Å ) aperture data acquired in September 1999 has been presented by Feldman et al. [JGR, 106, 8119-8129, 2001]. The current study focuses on preliminary analysis of two optically thick atomic oxygen emission features: Oi\ 989~Å coupled with the forbidden fluorescence emission at 1172~Å, and the OI\ 1026~Å sextuplet blended with atomic hydrogen Lyman~β resonance scattering. While FUV features (e.g., Oi\ 1356~Å ) typically used to provide atomic oxygen density distribution information are outside the FUSE spectral interval, the high spectral resolution and flux calibration provide for determination of a number of key spectral parameters, e.g., the electron impact excitation cross section magnitude and the 1172/989 branching ratio associated with Oi\ 989~Å intensities and the contribution of true Oi\ multiplet resonance scattering to 1026~Å intensities seen in the dayglow.

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