Dr. Judy Mohr Profile

Dr. Judy Mohr

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Proceedings Article | 9 October 2008 Paper

Optical turbulence profiling at Mount John University Observatory

Judy Mohr, Rachel Johnston, C. Clare Worley, Peter Cottrell

Proceedings Volume 7108, 710809 (2008) https://doi.org/10.1117/12.799756

KEYWORDS: Stars, Telescopes, Turbulence, Scintillation, Adaptive optics, Atmospheric turbulence, Binary data, Optical turbulence, Profiling, Observatories

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The distortion of images due to atmospheric turbulence is one of the major problems in astronomical imaging. To compensate for turbulence induced aberrations in real-time, it is vital to have an accurate model of turbulence strength, C²_N(h), and the average wind velocity, V(h), above a given site. To that end, a bread-board based SCIntillation Detection and Ranging (SCIDAR) system was developed for the Mount John University Observatory (MJUO), located in New Zealand. The system, constructed from commercially available off-the-shelf components, provides the flexibility to capture simultaneous pupil-plane and generalised SCIDAR. This provides a useful tool for the measurement of optical turbulence at sites where the near-ground turbulence is exceptionally strong and masks higher altitude layers. Measurements taken at MJUO, using the purpose-built instrument over the last few years, consistently indicate the presence of very strong near-ground turbulence and at least two high altitude turbulence layers (approximately 6 km and 11km above the site), with an additional layer at 1-3 km when strong ground winds are present. The C²_N(h) trends from several months in 2005 and 2007 and the V(h) trends from two months in 2007 are presented. The coherence length, r₀, for the full profile was consistently 6-7 cm regardless of season or weather conditions in the months used in this trending. The Greenwood frequency, f_G , ranged between 12 and 30 Hz for May and June 2007.

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