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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 6, Iss. 3 — Mar. 1, 1967
  • pp: 497–503

Optical Effects of Thermal Structure in the Lower Atmosphere

C. E. Coulman and D. N. B. Hall  »View Author Affiliations


Applied Optics, Vol. 6, Issue 3, pp. 497-503 (1967)
http://dx.doi.org/10.1364/AO.6.000497


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Abstract

Ascending convective plumes of inhomogeneous warm air interspersed with regions of air that are remarkably free from temperature fluctuations are sometimes observed in the lower layers of the atmosphere. A close correlation is demonstrated between intervals of good optical seeing along an upward-slanting path 20 m long and such periods of below average, air-temperature fluctuation. This correlation is sensitive to the azimuthal angle between wind direction and the vertical plane containing the optical path. The occurrence of temperature-quiescent periods at a given height is also shown to require the horizontal wind speed to be less than a critical value, and there is evidence that the thermal structure tends to be elongated in the direction of the wind. The range of amplitudes of image dancing observed in these experiments is comparable with that encountered in solar observations. The atmospheric temperature structure coefficients calculated from these optical experiments compare favorably with independent direct measurements.

© 1967 Optical Society of America

History
Original Manuscript: September 6, 1966
Published: March 1, 1967

Citation
C. E. Coulman and D. N. B. Hall, "Optical Effects of Thermal Structure in the Lower Atmosphere," Appl. Opt. 6, 497-503 (1967)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-6-3-497

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