Secular variations of OH nightglow emission and of the OH intensity-weighted temperature induced by gravity–wave forcing in the MLT region |
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Authors: | Tai-Yin Huang Michael Hickey |
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Institution: | 1. Department of Physics, The Pennsylvania State University Lehigh Valley, Fogelsville, PA 18051, USA;2. College of Arts and Sciences, Embry-Riddle Aeronautical University, Daytona Beach, FL 32114, USA |
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Abstract: | Secular variations of OH airglow (8,3) band and of the intensity-weighted temperature induced by a gravity wave packet at three latitudes in the northern hemisphere in the Mesosphere/Lower Thermosphere region are investigated using a 2-D, time-dependent, fully nonlinear OH chemistry–dynamics model. A net-cycled average survives due to wave transience and dissipation. The integrated OH (8,3) volume emission rates show a 20 percent increase induced by the wave packet. The corresponding intensity-weighted temperature shows an initial increase up to 2 percent then a gradual decrease for the remainder of the simulation time by the same wave packet. These secular variations could be mistaken as long-period or short-period waves in the airglow observations. Therefore, care must be taken when analyzing the data from observations. |
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Keywords: | OH chemistry Gravity wave Airglow Wave packet Secular variation |
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