Retrieval of thermospheric temperature and N2, O, and O2 concentrations from GUVI limb scans

Details Retrieval of thermospheric temperature and N2, O, and O2 concentrations from GUVI limb scans Retrieval of thermospheric temperature and N2, O, and O2 concentrations from GUVI limb scans

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsa41b0431m&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SA41B-0431

Physics

0310 Airglow And Aurora, 0355 Thermosphere: Composition And Chemistry, 7549 Ultraviolet Emissions

Scientific paper

The atomic oxygen 135.6 nm and the molecular nitrogen LBHS (140 - 150 nm) channels of the Global Ultraviolet Imager (GUVI) investigation can be used to remotely sense the state of the thermosphere. Observation of these emissions on the Earth limb are inverted using discrete inverse theory to retrieve altitude profiles of the N2, O, and O2 concentrations and temperature. The O/N2 column concentrations so obtained are found to be in excellent agreement with those derived independently from downward viewing of the Earth disk by GUVI. Low O/N2 regions during geomagnetic storms are found to have elevated temperatures. These composition and temperature correlations are consistent with the view that low O/N2 originates at high latitudes due to upwelling caused by Joule and particle heating. The molecular rich air then moves equatorward at night and migrates into the day where it can be observed by GUVI before cooling. Examples of this behavior from several geomagnetic storms will be presented.

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