A new method of measuring atmospheric seeing

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

A new method of measuring the integral in the atmosphere from stellar scintillations is proposed. This method is based on the variance of the logarithm of the ratio of intensities in circular and annular apertures. For outer and inner aperture diameters of 6 and 4 cm, respectively, the weighting function, which determines the sensitivity to C^2_p, is constant at heights above 4 km. The integral C^2_p over the whole thickness of the atmosphere can be measured by placing an annular aperture behind the exit pupil of a telescope at a virtual height of 4 km. When observing a 2.5m star for 100 s, a 0.5 seeing can be measured with a relative error of 0.35%. The new method may prove to be simpler and cheaper than traditional differential seeing monitors.

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