Morphological Studies of Mesospheric Chemical Heating Rates Using HRDI/UARS and SABER/TIMED Measurements

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0310 Airglow And Aurora, 0340 Middle Atmosphere: Composition And Chemistry, 0342 Middle Atmosphere: Energy Deposition

Scientific paper

Several exothermic chemical reactions involving atomic oxygen, atomic hydrogen, and ozone are important heating sources in the mesosphere. These reactions also are directly or indirectly responsible for the airglow emissions in this altitude region. The rates for these airglow emissions, specifically the O(1S) greenline, O2(1Σ ), O2(1Δ ), and OH Meinel bands, thus provide measurements of the chemical heating rates important for our understanding of mesospheric energetics. In this paper, we present the observed chemical heating rates of O+O+M, O+O2+M, and H+O3 reactions from nightglow emission rates measurements taken by the High Resolution Doppler Imager (HRDI) instrument onboard the Upper Atmosphere Research Satellite (UARS) and the Soundings of Atmosphere Using Broadband Emission Spectroscopy (SABER) instrument onboard Thermosphere-Ionosphere-Mesosphere, Energetics and Dynamics (TIMED). The temporal and spatial morphology of these chemical heating rates will be presented.

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