Shadow bands during the total solar eclipse of 11 July 1991 |
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| Institution: | 1. Physics Department, The Open University, Milton Keynes MK7 6AA U.K.;2. Institute of Astronomy, University of Cambridge, Cambridge CB3 0HA U.K.;1. Department for the History of Science and Scientific Archaeology, University of Science and Technology of China, Hefei, 230026, China;2. Institute of Archeology, Chinese Academy of Social Sciences, Beijing, 100710, China;1. Department of Cartographic, Geodetic and Photogrammetric Engineering, University of Jaen, Campus Las Lagunillas, 23071, Jaen, Spain;2. Department of Anthropology, Geography and History, University of Jaen, Campus Las Lagunillas, 23071, Jaen, Spain;1. College of Earth Sciences, Jilin University, Changchun 130061, China;2. Key Laboratory of Mineral Resources Evaluation in Northeast Asia, Ministry of Land and Resources of China, Changchun 130061, China;3. Research Center for Tibetan Plateau, Jilin University, China;1. College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China;2. Chengdu Center, China Geological Survey, Chengdu 610081, China;3. Department of Earth and Environmental Sciences, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada;4. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China;5. Manitoba Geological Survey, 1395 Ellice Avenue, Winnipeg, Manitoba R3G 3P2, Canada;1. College of Humanities, Arts and Social Sciences, Flinders University, GPO Box 2100, Adelaide, SA, 5001, Australia;2. School of Social and Cultural Studies, University of Western Australia, 35 Stirling Highway, Crawley, WA, 6009, Australia;3. Moesgaard Museum, Moesgaard Alle 15, 8270, Højbjerg, Denmark;4. John de Laeter Centre, Faculty of Science & Engineering, Curtin University, Bentley, WA, 6102, Australia |
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| Abstract: | We recorded shadow bands just before and just after the total phase of the solar eclipse of 11 July 1991. The recordings were made using two broad band silicon photodiodes separated horizontally by 100 mm. They faced the zenith, near to where the eclipsed Sun lay as seen from our observing site close to San José del Cabo in Baja California. The irradiance fluctuations associated with the shadow bands were around 0.04 W m?2 peak to peak on a background of 1–3 W m?2. The cross-correlation function indicates that the shadow bands were moving at about 1.8 m s?1 perpendicular to their extent. The power spectral density functions are in accord with the shadow band theory of Codona (1986), Astron. Astrophys. 164, 415–427]. |
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