Mesoscale Thermospheric Composition Perturbations due to Vertical Winds: Comparison of the Modeled OI 135.6 nm Auroral Emission to POLAR Ultraviolet Imager (UVI) Observations

Details Mesoscale Thermospheric Composition Perturbations due to Vertical Winds: Comparison of the Modeled OI 135.6 nm Auroral Emission to POLAR Ultraviolet Imager (UVI) Observations Mesoscale Thermospheric Composition Perturbations due to Vertical Winds: Comparison of the Modeled OI 135.6 nm Auroral Emission to POLAR Ultraviolet Imager (UVI) Observations

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsa12a0675k&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SA12A-0675

Physics

0300 Atmospheric Composition And Structure, 0310 Airglow And Aurora, 0355 Thermosphere: Composition And Chemistry

Scientific paper

Vertical displacement of the auroral zone thermosphere and the subsequent redistribution of its atomic oxygen (OI) and molecular species (N2, O2) density profiles is inferred at horizontal spatial scales of ~104 km2 from comparisons of POLAR UVI images to the modeled OI 135.6 nm auroral emission. The vertical displacement, hereafter referred to as the column shift, is a new modification to the electron transport code of Lummerzheim et al., [1989] and alters the MSIS-90 neutral model [Hedin, 1991] such that the modeled 135.6 nm emission matches the observed. The column shift simulates and parameterizes vertical wind effects (e.g. transport, disruption of diffusive equilibrium) and is compared to ground-based Fabry-Perot Spectrometer (FPS) OI 630.0 nm observations of upper thermospheric vertical velocities and displacements obtained at Inuvik, Northwest Territories, Canada (68.3° N, 226.33° E, L=9.9) and Poker Flat (65.1° N, 212.5° E, L=6) Alaska.

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