Measurements of the atmospheric transfer function at Mauna Kea, Hawaii

Physics – Optics

Scientific paper

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Astronomical Observatories, Atmospheric Turbulence, Coherent Light, Optical Measurement, Transfer Functions, Atmospheric Optics, Data Acquisition, Diffraction Patterns, Image Motion Compensation, Interferometry, Microdensitometers, Telescopes, Turbulence Effects

Scientific paper

Measurements are presented of the long time-averaged transfer function (or mutual coherence function) of the atmosphere, taken at Mauna Kea Observatory, Hawaii, using a coherence interferometer. Over the 10 nights of observation the seeing was variable, ranging from typical widths of the transfer function at the 25 per cent level of approximately 0.23 cycles/arcsec (2.5 cm in the pupil) to approximately 1.00 cycles/arcsec (11.0 cm in the pupil). The latter values correspond to sub-arcsec seeing. The variation with zenith angle and the form of the atmospheric transfer function were briefly investigated.

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