Shadow bands during the total solar eclipse of 3 November 1994 |
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| Institution: | 1. Department of Communication, University of Nebraska at Kearney, Kearney, NE 68849, USA;2. The Crane Trust, Wood River, NE 68883, USA;3. Department of Forestry and Natural Resources, Purdue University, West Lafayette, IN 47907, USA;4. Center for Global Soundscapes, Purdue University, West Lafayette, IN 47907, USA;5. Department of Biology, University of Nebraska at Kearney, Kearney, NE 68849, USA;6. Department of Agricultural Leadership, Education & Communication, University of Nebraska-Lincoln, 68583, USA;7. Michael Forsberg Photography, Lincoln, NE 68542, USA |
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| Abstract: | We recorded shadow bands just before and just after the total phase of the solar eclipse of 3 November 1994. The recordings were made using two broad-band silicon photodiodes separated by 100 mm. They were mounted on a plate that faced the eclipsed Sun, which was at an altitude of 32.4° as seen from our observing site 4500 m above sea level between Putre and Lake Chungara in northern Chile. The irradiance fluctuations associated with the shadow bands were around 0.008 W m?2 rms on a background of about 2–8 W m?2. The cross-correlation function indicates that the shadow bands were moving at a speed of 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). We carried out a similar experiment in Baja California during the eclipse of 11 July 1991. In spite of teh considerable differences between the two circumstances, our results on the two occasions are broadly similar. |
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