Search for a chromospheric resonator above sunspots |
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| Institution: | 1. Institute of Theoretical Astrophysics, University of Oslo, P. Box 1029, 0315 Oslo, Norway;2. European Space Agency, NASA Goddard Space Flight Center, Mail Code 682.3, Maryland 20771, USA;1. Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;2. Ministry of Natural Resources, Key Laboratory of Metallogeny and Mineral Assessment, Beijing 100037, China;3. The Key Laboratory of the Ministry of Education on Solid Waste Treatment and Recycling, School of Environment and Resource, Southwest University of Science and Technology, Chengdu 621010, China;1. School of Mathematics and Statistics, Fuzhou University, Fuzhou, 350108, China;2. Institute of Applied Physics and Computational Mathematics, Beijing, 100088, China;3. Center for Applied Mathematics of Fujian Province, Fuzhou, 350108, China;4. Key Laboratory of Operations Research and Cybernetics of Fujian Universities, Fuzhou, 350108, China;1. Department of Polymer Engineering, Faculty of Engineering, Islamic Azad University, South Tehran Branch, P.O. Box 19585‐466 Tehran, Iran;2. Nanotechnology Research Centre, Islamic Azad University, South Tehran Branch, 15847-43311, Tehran, Iran;3. Department of Chemistry, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran |
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| Abstract: | We have recently observed thirteen sunspots, both with CDS on SOHO and TRACE. For each sunspot we investigate the oscillations in the chromosphere, transition region and corona. Above the umbra the power spectra show one dominant peak corresponding to a period of 3 minutes. The intensity oscillation amplitude increases with increasing temperature, reaches a maximum for lines emitting close to 1–2 × 105 K, and decreases for higher temperatures. Part of the wave energy penetrates into the corona, channeled into small areas that appear to coincide with the endpoints of sunspot coronal loops. The observations support the hypothesis that the oscillations are caused by upwardly propagating acoustic waves and show no signs of the resonances, equally spaced ≈1 mHz in frequency, predicted by the chromospheric resonator theories. |
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