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Hokupa'a anisoplana...
Hokupa'a anisoplanatism and Mauna Kea turbulence characterization
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- Flicker, Ralf (author)
- Lund University,Lunds universitet,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science
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Rigaut, FJ (author)
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(creator_code:org_t)
- IOP Publishing, 2002
- 2002
- English.
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In: Publications of the Astronomical Society of the Pacific. - : IOP Publishing. - 1538-3873 .- 0004-6280. ; 114:799, s. 1006-1015
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Abstract
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- A data set of adaptive optics images has been analyzed in order to study the effects of angular anisoplanatism and to characterize Mauna Kea nighttime turbulence. The data set consists of a selection of Galactic center images obtained with the adaptive optics instrument Hokupa'a and the near-infrared camera QUIRC on the Gemini-North 8 m telescope. Using the Strehl ratio and the FWHM as tracers for anisoplanatism in the images, it is possible to draw conclusions about the effective turbulence height (h) over bar by model-fitting synthetic data. From the relatively small statistical sample, we obtain a median (h) over bar =3.5 km, with 10th and 90th percentiles being 2.2 and 5.6 km. The implications of these findings for a turbulence-conjugated adaptive optics system are addressed. We also find the Zernike modal equivalent of Hokupa'a to be Napproximate to18, i.e., on the average slightly better than 4 radial degrees.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Publication and Content Type
- art (subject category)
- ref (subject category)
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