Physics
Scientific paper
Jun 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000jgr...10512823s&link_type=abstract
Journal of Geophysical Research, Volume 105, Issue A6, p. 12823-12832
Physics
3
Atmospheric Composition And Structure: Thermosphere-Composition And Chemistry, Ionosphere: Ionosphere/Atmosphere Interactions, Ionosphere: Modeling And Forecasting, Ionosphere: Instruments And Techniques
Scientific paper
Thermospheric density and temperature are often derived from ionospheric observables measured by incoherent scatter radar (ISR) via solutions of the F region ion energy balance equation. However, this equation, consisting of an electron heat source balancing a neutral heat sink, can break down near the exobase, where the electron heat source can be too small by as much as 40%. An additional heat source is required, and theoretical and experimental studies point to a hot neutral oxygen (hot O) geocorona near the Earth's exobase to supply it. Hot O must therefore be included in the ion energy balance equation; however, its profile shape and concentration are unknown. We develop a simple method for including hot O profiles in the ion temperature fitting equation by calculating hot O concentration as a function of altitude and including the hot O heat source in the ion energy equation. The technique is tested as a function of solar cycle for March equinox conditions, and a χ2 analysis indicates that the hot O is more likely to form a layer than a concentration profile which decreases as a function of altitude.
Oliver William L.
Schoendorf Jacqueline
Young Larry A.
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