Molecular Oxygen in the Thermosphere: Issues and Measurement Strategies

Details Molecular Oxygen in the Thermosphere: Issues and Measurement Strategies Molecular Oxygen in the Thermosphere: Issues and Measurement Strategies

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsa22a..08p&link_type=abstract

American Geophysical Union, Spring Meeting 2002, abstract #SA22A-08

Computer Science

Databases

0355 Thermosphere: Composition And Chemistry, 1650 Solar Variability

Scientific paper

We review the state of empirical knowledge regarding the distribution of molecular oxygen in the lower thermosphere (100-200 km), as embodied by the new NRLMSISE-00 empirical atmospheric model, its predecessors, and the underlying databases. For altitudes above 120 km, the two major classes of data (mass spectrometer and solar ultraviolet [UV] absorption) disagree significantly regarding the magnitude of the O2 density and the dependence on solar activity. As a result, the addition of the Solar Maximum Mission (SMM) data set (based on solar UV absorption) to the NRLMSIS database has directly impacted the new model, increasing the complexity of the model's formulation and generally reducing the thermospheric O2 density relative to MSISE-90. Beyond interest in the thermosphere itself, this issue materially affects detailed models of ionospheric chemistry and dynamics as well as modeling of the upper atmospheric airglow. Because these are key elements of both experimental and operational systems which measure and forecast the near-Earth space environment, we present strategies for augmenting the database through analysis of existing data and through future measurements in order to resolve this issue.

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