Long Term Trend and 11-Year Cyclic Variations in Mesopause Temperature Data Observed by Michelson Interferometers at Arctic and Antarctic Sites

Physics

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7536 Solar Activity Cycle (2162), 0310 Airglow And Aurora, 0342 Middle Atmosphere: Energy Deposition (3334), 1610 Atmosphere (0315, 0325), 2479 Solar Radiation And Cosmic Ray Effects

Scientific paper

The response of the mesopause temperature to solar cycle variations has been investigated using OH airglow observations from Michelson Interferometer instruments located at Eureka (80o N, 85.56º W), Canada, Resolute Bay (74.68º N, 94.90º W), Canada, and South Pole Station, Antarctica (90o S). These aforementioned stations have been making continuous measurements of temperature and airglow emissions during the six months of each polar winter night. In this paper we present our results to elucidate solar cycle and long-term trend in the MI temperature time series data. We discuss mesospheric seasonal variation in the Northern and Southern hemispheres and compare these mesopause temperatures to highlight similarities and disagreements observed in the OH temperature response to solar cycle at Arctic and Antarctic sites. In addition, we also present He 10830Å line as a way of monitoring the response of the thermosphere to changes in solar irradiance in the EUV region over a solar cycle period.

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