The effects of atmospheric turbulence on telescopic observations |
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| Authors: | F K Brunner |
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| Institution: | (1) Dept. of Geodetic Science, University of Stuttgart, D-7000 Stuttgart 1, FRG;(2) Present address: Wild Heerbrugg Ltd., CH-9435 Heerbrugg, Switzerland |
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| Abstract: | Telescopic observations to terrestrial and extraterrestrial objects are affected by atmospheric turbulence. The structure
of atmospheric turbulence is reviewed in tems of the refractive index structure parameter. The mean and fluctuating refraction
effects of the turbulent atmosphere on the propagation of electromagnetic waves are addressed. The known formulae for the
variance and the spectrum of the angle-of-arrival fluctuations are presented and experimental results are summarised. The
angular resolution is compared with the pointing precision of a telescope for visual observations through a turbulent atmosphere.
The ultimate precision of direction measurements is shown to be a function of instrumental design parameters, the strength
of atmospheric turbulence, and the length of the averaging period. |
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