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Cooling rate of thermal electrons by electron impact excitation of fine structure levels of atomic oxygen
Authors:A V Pavlov  K A Berrington
Institution:(1) Institute of Terrestrial Magnetism, Ionosphere and Radio-Wave Propagation, Russia Academy of Science (IZMIRAN), Troitsk, Moscow Region, 142092, Russia;(2) School of Science and Mathematics, Sheffield Hallam University, Sheffield, S1 1WB, UK
Abstract:The atomic oxygen fine structure cooling rate of thermal electrons based on new effective collision strengths for electron impact excitation of the ground-state 3P fine-structure levels in atomic oxygen have been fitted to an analytical expression which is available to the researcher for quick reference and accurate computer modeling with a minimum of calculations. We found that at the F region altitudes of the ionosphere the new cooling rate is much less than the currently used fine structure cooling rates (up to a factor of 2–4), and this cooling rate is not the dominant electron cooling process in the F region of the ionosphere at middle latitudes.
Keywords:Atmospheric composition and structure (thermosphere - composition and density)  Ionosphere (mid-latitude ionosphere  modelling and forecasting)
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