Spatiotemporal study of the impulse response of the earth's atmosphere by solar-limb observations

Details Spatiotemporal study of the impulse response of the earth's atmosphere by solar-limb observations Spatiotemporal study of the impulse response of the earth's atmosphere by solar-limb observations

Feb 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jopt...14...11d&link_type=abstract

Journal of Optics (ISSN 0150-536X), vol. 14, Jan.-Feb. 1983, p. 11-17. In French.

Physics

Optics

1

Atmospheric Effects, Blurring, Image Motion Compensation, Point Spread Functions, Solar Instruments, Solar Limb, Speckle Patterns, Atmospheric Turbulence, Autocorrelation, Charge Coupled Devices, Image Processing, Temporal Distribution

Scientific paper

The temporal variation of image motion and blurring caused by atmospheric effects is analyzed statistically on the basis of solar-limb observations obtained with the 75-cm solar tower telescope at Sacramento Peak Observatory using a 60-A-bandwidth filter centered at 6000 A, a 0.05-arcsec slit, and a 3 x 4-mm, 100 x 100-pixel CCD detector. A rotating mirror was used to sweep the slit image over the detector every 53.5 msec. Data-processing techniques applied to remove parasitic perturbations are described, and the results are illustrated with graphs and sample images. The time constants obtained by autocorrelation are 8 msec for image motion and 9.5 msec for blurring, in agreement with the weakest values of other experiments; the setup did not allow the evaluation of constants greater than 53.5 msec. The results confirm the inertial-turbulence hypothesis of Roddier (1981), the Fried parameter r0 being about 10.5 cm.

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