Reanalysis of the British NHO Site-Survey observations at the NW cone and 88-inch ridge sites

Physics – Optics

Scientific paper

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Astronomical Observatories, Hawaii, Site Selection, Telescopes, Visibility, Wind Effects, Atmospheric Optics, High Altitude Environments, Night Sky

Scientific paper

The observations obtained by the British Northern Hemisphere Observatory Site Survey team in 1974 - 75 at the NW Cone and on the 88-inch ridge on Mauna Kea have been reanalyzed. The new analysis confirms the result of the initial study of these data: better seeing conditions existed at the NW Cone than on the 88-inch ridge during the period covered by the observations. The present, more detailed, analysis indicates that the seeing at both sites became poorer and wind-speed dependent with southerly winds. That deterioration was larger at the 88-inch ridge site than at the NW Cone, indicating (1) that the effect was local in origin and was not due to high-altitude meteorological conditions, and (2) that whatever the local cause, the 88 inch ridge site was more adversely affected than was the NW Cone.

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