Error due to atmospheric turbulence effects on solar diameter measurements performed with an astrolabe

Details Error due to atmospheric turbulence effects on solar diameter measurements performed with an astrolabe Error due to atmospheric turbulence effects on solar diameter measurements performed with an astrolabe

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26as..138..155l&link_type=abstract

Astronomy and Astrophysics Supplement, v.138, p.155-162

Astronomy and Astrophysics

Astrophysics

8

Sun: Fundamental Parameters, Atmospheric Effects, Methods: Numerical

Scientific paper

Diameter measurements performed with the solar astrolabe are affected by instrumental and atmospheric effects. The problem is to know how these effects contribute to the error on diameter measurements. Thus, a numerical simulation is developed to bring some responses to this problem. For this purpose, synthetic images of the Sun similar to the ones obtained by the instrument through the Earth atmosphere are simulated. A fractal model is used to generate randomly perturbed wavefronts and therefore optical response of the whole system, atmosphere and instrument. Many sequences of solar images are then simulated for various observation conditions (Fried's parameter r0, spatial coherence outer scale L0 and atmospheric characteristic times). They are used to define the time of contact of the direct and reflected solar images which is fundamental in the solar astrolabe experiment. It is then studied as a function of the observation conditions relatively to the experimental characteristics (exposure time).

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