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Optical Turbulence Measurements and Models for Mount John University Observatory

Published online by Cambridge University Press:  02 January 2013

J. L. Mohr ,
R. A. Johnston  and
P. L. Cottrell
J. L. Mohr*
Affiliation:
Department of Physics and Astronomy, University of Canterbury, Private Bag 4800, Christchurch 8020, New Zealand
R. A. Johnston
Affiliation:
ARANZ Scanning Ltd. (ASL), PO Box 3894, Christchurch 8011, New Zealand
P. L. Cottrell
Affiliation:
Department of Physics and Astronomy, University of Canterbury, Private Bag 4800, Christchurch 8020, New Zealand
*
CCorresponding author. Email: [email protected]
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Abstract

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Site measurements were collected at Mount John University Observatory in 2005 and 2007 using a purpose-built scintillation detection and ranging system. C2N(h) profiling indicates a weak layer located at 12–14 km above sea level and strong low altitude turbulence extending up to 5 km. During calm weather conditions, an additional layer was detected at 6–8 km above sea level. V(h) profiling suggests that tropopause layer velocities are nominally 12–30m s−1, and near-ground velocities range between 2 and 20m s−1, dependent on weather. Little seasonal variation was detected in either C2N(h) and V(h) profiles. The average coherence length, r0, was found to be 7±1 cm for the full profile at a wavelength of 589 nm. The average isoplanatic angle, θ0, was 1.0±0.1 arcsec. The mean turbulence altitude, , was found to be 2.0±0.7 km above sea level. No average in the Greenwood frequency, fG, could be established due to the gaps present in the V(h) profiles obtained. A modified Hufnagel-Valley model was developed to describe the C2N(h) profiles at Mount John, which estimates r0 at 6 cm and θ0 at 0.9 arcsec. A series of V(h) models were developed, based on the Greenwood wind model with an additional peak located at low altitudes. Using the C2N(h) model and the suggested V(h) model for moderate ground wind speeds, fG is estimated at 79 Hz.

Keywords

site testingatmospheric effectsinstrumentation: miscellaneousinstrumentation: adaptive optics
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 27 , Issue 3 , 2010 , pp. 347 - 359
Copyright
Copyright © Astronomical Society of Australia 2010

References

Andrews, L. C., 2004, Field Guide to Atmospheric Optics, vol. FG03 of SPIE Field Guides (Bellingham, WA: SPIE Press)CrossRefGoogle Scholar
Avila, R., Vernin, J. & Sanchez, L. J., 1997, Appl. Opt., 36, 7898CrossRefGoogle Scholar
Avila, R., Vernin, J. & Cuevas, S., 1998, PASP, 110, 1106CrossRefGoogle Scholar
Avila, R., Vernin, J. & Sanchez, L. J., 2001, A&A, 369, 364Google Scholar
Avila, R., Masciadri, E., Vernin, J. & Sanchez, L. J., 2004, PASP, 116, 682CrossRefGoogle Scholar
Avila, R., Sanchez, L. J., Ibañez, F., Masciadri, E., Azouit, M., Agabi, A. & Cuevas, S., 2007, RevMexAA (Serie de Conferencias), 31, 71Google Scholar
Avila, R., Avilés, J. L., Wilson, R. W., Chun, M., Butterley, T. & Carrasco, E., 2008, MNRAS, 387, 1511CrossRefGoogle Scholar
Fried, D. L., 1966, J. Opt. Soc. Am., 56, 1372CrossRefGoogle Scholar
Fuensalida, J. J. et al. , 2004, in Advancements in Adaptive Optics, Eds. Calia, D. B., Ellerbroek, B. L. & Ragazzoni, R., Proc. SPIE, 5490, 749Google Scholar
Garcí-Lorenzo, B., Eff-Darwich, A., Fuensalida, J. J. & Castro-Almazan, J., 2009, MNRAS, 397, 1633CrossRefGoogle Scholar
Hardy, J. W., 1998, Adaptive Optics for Astronomical Telescopes, no. 16 in Oxford Series in Optical and Imaging Sciences (New York: Oxford University Press)Google Scholar
Hearnshaw, J. B., Barnes, S. I., Kershaw, G. M., Frost, N., Graham, G., Ritchie, R. & Nankivell, G. R., 2002, ExA, 13, 59Google Scholar
Johnston, R. A., 2000, Inverse Problems in Astronomical Imaging, PhD Thesis, University of CanterburyGoogle Scholar
Johnston, R. A., Connolly, T. J. & Lane, R. G., 2000, Opt. Commun., 181, 267CrossRefGoogle Scholar
Johnston, R. A. & Lane, R. G., 2000, Appl. Opt., 39, 4761CrossRefGoogle Scholar
Johnston, R. A., Dainty, C., Wooder, N. J. & Lane, R. G., 2002, Appl. Opt., 41, 6768CrossRefGoogle Scholar
Johnston, R. A., Mohr, J. L., Cottrell, P. L. & Lane, R. G., 2004, in Proceedings of Image and Vision Computing New Zealand, Eds. Pairman, D., North, H. & McNeill, S., 209Google Scholar
Johnston, R. A., Worley, C. C., Mohr, J. L., Lane, R. G. & Cottrell, P. L., 2005, in Proceedings of Image and Vision Computing New Zealand, Ed. McCane, B., 487Google Scholar
Klückers, V. A., Wooder, N. J., Nicholls, T. W., Adcock, M. J., Munro, I. H. & Dainty, J. C., 1998, Astron. Astrophys. Suppl. Ser., 130, 141CrossRefGoogle Scholar
Masciadri, E., Stoesz, J., Hagelin, S. & Lascaux, F., 2010, MNRAS, in pressGoogle Scholar
Mohr, J. L., Johnston, R. A., Worley, C. C. & Cottrell, P. L., 2006, in Proceedings of Image and Vision Computing New Zealand, Eds. Delmas, P., James, J. & Morris, J., 523Google Scholar
Mohr, J. L., Johnston, R. A. & Cottrell, P. L., 2008a, in 23rd International Conference Image and Vision Computing New Zealand, Eds. Irie, K. & Pairman, D.Google Scholar
Mohr, J. L., Johnston, R. A., Worley, C. C. & Cottrell, P. L., 2008b, in Optics in Atmospheric Propagation and Adaptive Systems XI, Eds. Kohnle, A., Stein, K. & Gonglewski, J. D., Proc. SPIE, 7108, 710809Google Scholar
Mohr, J. L., 2009, Atmospheric Turbulence Characterisa tion Using Scintillation Detection and Ranging, PhD Thesis, University of CanterburyGoogle Scholar
Northcott, M. J., 1999, in Adaptive Optics in Astronomy, Ed. Roddier, F. (Cambridge: Cambridge University Press), 155CrossRefGoogle Scholar
Parenti, R. R. & Sasiela, R. J., 1994, J. Opt. Soc. Am. A, 11, 288CrossRefGoogle Scholar
Prieur, J.-L., Daigne, G. & Avila, R., 2001, A&A, 371, 366Google Scholar
Roddier, F., 1981, in Progress in Optics, Ed. Wolf, E. (Amsterdam: North-Holland Publishing Company), 19, 281Google Scholar
Sturman, A. & Tapper, N., 1996, The Weather and Climate of Australia and New Zealand (Melbourne: Oxford University Press)Google Scholar
Tokovinin, A., Vernin, J., Ziad, A. & Chun, M. R., 2005, PASP, 117, 395CrossRefGoogle Scholar
Tyson, R. K., 1991, Principles of Adaptive Optics (Boston: Academic Press, Inc.)Google Scholar
Tyson, R. K. & Frazier, B. W., 2004, Field Guide to Adaptive Optics, vol. FG03 of SPIE Field Guides (Bellingham, WA: SPIE Press)CrossRefGoogle Scholar
Wang, L., Schöck, M. & Chanan, G., 2008, Appl. Opt., 47, 1880CrossRefGoogle Scholar