Oscillations in D-region absorption at periods of one to two months |
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| Institution: | 1. School of Mechatronic Engineering, China University of Mining and Technology, No1, Daxue Road, Xuzhou 221116, PR China;2. Jiangsu Key Laboratory of Mine Mechanical and Electrical Equipment, China University of Mining and Technology, Xuzhou 221116, PR China;3. Key Laboratory of Power Machinery and Engineering, Shanghai Jiao Tong University, Shanghai 200240, PR China;4. Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109, USA;5. Nonlinear Dynamics, Chaos and Complex Systems Group, Departamento de Física, Universidad Rey Juan Carlos, Tulipán s/n, 28933 Móstoles, Madrid, Spain;6. Department of Applied Informatics, Kaunas University of Technology, Studentu 50-407, Kaunas 51368, Lithuania;7. Institute for Physical Science and Technology, University of Maryland, College Park, Maryland 20742, USA;2. NOAA National Centers for Environmental Information (NCEI), Boulder, CO, United States;3. Laboratory for Atmospheric and Space Physics (LASP), University of Colorado-Boulder, Boulder, CO, United States;4. NOAA Space Weather Prediction Center (SWPC), Boulder, CO, United States;5. Space Environment Technologies, Thornton, CO, United States |
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| Abstract: | One to two month oscillations in D-region absorption are found in seven years of daily ?-min data from low latitude stations at Singapore (1°N, 104°E) and Rarotonga (21°S, 160°W). Coherency (cross-spectral) analyses reveal that solar flux variations account for much of the ?-min variance at these periods. Over the range of periods from 10 to 200 days, statistically significant linear correlation is found between the ?-min time series and contemporaneous 10.7cm solar flux measurements at periods of 16–19 days, the 26–29 day solar rotation band, and a broad band covering 43–80 day periods. |
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