Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...164..415c&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 164, no. 2, Aug. 1986, p. 415-427. Research supported by the University of Cal
Astronomy and Astrophysics
Astrophysics
10
Lunar Shadow, Scintillation, Solar Eclipses, Astronomical Photometry, Atmospheric Models, Atmospheric Turbulence, Diffraction Patterns, Tropopause
Scientific paper
The results of a theoretical investigation of solar-eclipse shadow bands are presented. The study provides both quantitative and qualitative insight into the factors governing the visibility of shadow bands. Using only standard weak scattering scintillation theory and standard models for atmospheric turbulence, all of the salient features of the shadow bands are explained. The contrast is found to be greater for shorter wavelengths and the band spacing to scale like the square root of the wavelength very near totality. For times greater than about 20 seconds before (or after) totality, the band spacing becomes frequency-independent, and the scintillations are dominated by turbulence near the ground. The turbulence mainly responsible for shadow bands is found to be below two kilometers in altitude.
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