Observations of shadow bands at the total solar eclipse of 16 February 1980

Details Observations of shadow bands at the total solar eclipse of 16 February 1980 Observations of shadow bands at the total solar eclipse of 16 February 1980

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apopt..23.4390m&link_type=abstract

Applied Optics (ISSN 0003-6935), vol. 23, Dec. 1, 1984, p. 4390-4393. NSF-supported research.

Physics

Optics

6

Atmospheric Optics, Solar Eclipses, Cross Correlation, Fourier Analysis, P-I-N Junctions, Power Spectra, Scintillation, Shadows

Scientific paper

Photoelectric observations of short term light variations (shadow bands) at the 16 Feb. 1980 total solar eclipse have been made using a set of spatially separated PIN diodes. Light variations in a bandpass of 1-500 Hz were detected during the half-minutes preceding and following the total phase. Fourier analysis of the noise spectrum of the variations reveals a sharp drop-off for frequencies above 50 Hz and an overall spectrum quite similar to previously reported power spectra of stellar scintillation. This is consistent with an atmospheric origin for the shadow bands. Cross-correlations between the detector outputs are low, suggesting a short persistence time for the turbulent elements causing the patterns.

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