Polar thermospheric Joule heating, and redistribution of recombination energy in the upper mesosphere

摘要: Kellogg, W. (1961, J. Met. 18, 373) suggested that transport of atomic oxygen from the summer into winter hemisphere and subsequent release energy by three body recombination, O + N2→O2 N2 E, may contribute significantly to so-called mesopause temperature anomaly (increase in winter). Earlier model calculations have shown Kellogg's mechanism produces about a 10% increase at 90 km. This process, however, is partly compensated differential heating absorption UV radiation associated with dissociation O2. In auroral region thermosphere, there steady (component of) dissipation Joule (with peak near 130 km) causing redistribution depletion due wind-induced diffusion. With removal O. latent chemical normally released recombination also removed, result decreases almost 2% Through dynamic feedback, this process reduces 25% perturbation exosphere 7% polar latitudes. Under influence internal dynamo interaction, prevailing zonal circulation upper thermosphere (small magnitude) changes direction when considered. The above described effects are very sensitive adopted rates eddy They strongly time dependent reduced for disturbances magnetic storms.