Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsa22a0713s&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SA22A-0713
Physics
0310 Airglow And Aurora, 0355 Thermosphere: Composition And Chemistry, 0394 Instruments And Techniques
Scientific paper
Atomic oxygen and molecular nitrogen densities in the thermosphere vary greatly with solar and geomagnetic activity. Measurements of these major species are important for addressing practical issues such as satellite drag and orbit determination, as well as forming the basis for interpreting ionospheric production and loss. We demonstrate the feasibility of using middle ultraviolet airglow for remote sensing of thermospheric O and N2 densities. In particular, we present results from a forward model of the OII 247.0~nm airglow emission, produced by photoionization and excitation of O, and the NII 214.3~nm emission, produced by photodissociative ionization and excitation of N2. Since both depend primarily on direct solar extreme ultraviolet radiation, modeling does not require a photoelectron parameterization that complicates many of the pertinent remote sensing candidates. Verification of the model output was done with a comparison to previously published data. Our simulations suggest the capability of determining O and N2 densities through the simultaneous measurement of a limb profile of these two emissions, coupled with discrete inverse theory or a comparable retrieval analysis.
Meier Robert R.
Stephan Andrew Ward
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