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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 20, Iss. 18 — Sep. 15, 1981
  • pp: 3227–3232

Scintillation at two optical frequencies

W. B. Hubbard and H. J. Reitsema  »View Author Affiliations


Applied Optics, Vol. 20, Issue 18, pp. 3227-3232 (1981)
http://dx.doi.org/10.1364/AO.20.003227


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Abstract

Stellar scintillation data were obtained on a single night at a variety of zenith distances and azimuths, using a photon-counting photometer recording at 100 Hz simultaneously at wavelengths of 0.475 μm and 0.870 μm. Orientable apertures of 42-cm diam separated by 1 m were used to establish the average upper atmosphere wind direction and velocity. Dispersion in the earth’s atmosphere separate the average optical paths at the two wavelengths, permitting a reconstruction of the spatial cross-correlation function for scintillations, independent of assumptions about differential fluid motions. Although there is clear evidence of a complicated velocity field, scintillation power was predominantly produced by levels at pressures of 130 ± 30 mbar. The data are not grossly inconsistent with layers of isotropic Kolmogorov turbulence, but there is some evidence for deviation from the Kolmogorov spectral index and/or anisotropy.

© 1981 Optical Society of America

History
Original Manuscript: March 7, 1981
Published: September 15, 1981

Citation
W. B. Hubbard and H. J. Reitsema, "Scintillation at two optical frequencies," Appl. Opt. 20, 3227-3232 (1981)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-20-18-3227

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