Optical C sub N sq remote sensing in the upper atmospheric by multidimensional analysis of stellar scintillation

Details Optical C sub N sq remote sensing in the upper atmospheric by multidimensional analysis of stellar scintillation Optical C sub N sq remote sensing in the upper atmospheric by multidimensional analysis of stellar scintillation

Jul 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981stop.agar.....v&link_type=abstract

In AGARD Spec. Topics in Opt. Propagation 9 p (SEE N81-33982 24-74)

Physics

Optics

Atmospheric Turbulence, Reflection, Scintillation, Statistical Analysis, Stellar Radiation, Upper Atmosphere, Electro-Optics, Power Spectra, Remote Sensing, Spatial Distribution, Statistical Correlation, Temporal Distribution

Scientific paper

Multidimensional statistical analysis of stellar scintillation, the motion of the various atmospheric turbulent layers can be determined both in magnitude and direction, in addition to their turbulent strength (as measured by square (sub n or square C sub to) as a function of altitude. A system which consists of a very light-sensitive image receiver (television camera), followed by a specialized numerical computer (two-dimensional correlator) which utilizes in real time the spatial distribution of the irradiance of a large telescope entrance pupil was developed. This apparatus allows identification of fast temporal variations of the vertical profiles of turbulence strength, using sounding only 10 sec apart. By tracking the double star gamma Virginis, a vertical resolution of about 1.7 km was achieved. Temporal evolution of the reflective index at a given altitude shows that the turbulence remains for several hours but it concentrates in small patches of a few kilometers length. A statistical study of these variations shows that it is possible to modelize the intermittency of the atmospheric turbulence by a this lag power law such as tau to the 0.31 power.

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