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Statistics of turbulence parameters at Maunakea using the multiple wavefront sensor data of RAVEN

Ono, Yoshito H. and Correia, Carlos M. and Andersen, Dave R. and Lardiére, Olivier and Oya, Shin and Akiyama, Masayuki and Jackson, Kate and Bradley, Colin (2017) Statistics of turbulence parameters at Maunakea using the multiple wavefront sensor data of RAVEN. Monthly Notices of the Royal Astronomical Society, 465 (4). pp. 4931-4941. ISSN 0035-8711.

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Prior statistical knowledge of atmospheric turbulence is essential for designing, optimizing and evaluating tomographic adaptive optics systems. We present the statistics of the vertical profiles of C^2_N and the outer scale at Maunakea estimated using a SLOpe Detection And Ranging (SLODAR) method from on-sky telemetry taken by a multi-object adaptive optics (MOAO) demonstrator, called RAVEN, on the Subaru telescope. In our SLODAR method, the profiles are estimated by fitting the theoretical autocorrelations and cross-correlations of measurements from multiple Shack–Haltmann wavefront sensors to the observed correlations via the non-linear Levenberg–Marquardt Algorithm (LMA). The analytical derivatives of the spatial phase structure function with respect to its parameters for the LMA are also developed. From a total of 12 nights in the summer season, a large ground C^2_N fraction of 54.3 per cent is found, with median estimated seeing of 0.460 arcsec. This median seeing value is below the results for Maunakea from the literature (0.6–0.7 arcsec). The average C^2_N profile is in good agreement with results from the literature, except for the ground layer. The median value of the outer scale is 25.5 m and the outer scale is larger at higher altitudes; these trends of the outer scale are consistent with findings in the literature.

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Additional Information:© 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2016 November 24. Received 2016 November 24; in original form 2016 October 17. This work is supported by the Japan Society for the Promotion of Science (JSPS) Grant-in-Aid for JSPS Fellows (15J02510) and the A*MIDEX project (no. ANR-11-IDEX-0001-02) funded by the ‘Investissements d'Avenir’ French Government programme, managed by the French National Research Agency (ANR). MA is supported by JSPS Grant-in-Aid for Scientific Research (B) (26287027). The authors thank Olivier Martin for many discussions, the referee for his/her comments and suggestions and the staff members of the Subaru telescope for their support.
Funding AgencyGrant Number
Japan Society for the Promotion of Science (JSPS)15J02510
Agence Nationale pour la Recherche (ANR)ANR-11-IDEX-0001-02
Japan Society for the Promotion of Science (JSPS)26287027
Subject Keywords:atmospheric effects, instrumentation: adaptive optics, site testing
Issue or Number:4
Record Number:CaltechAUTHORS:20170331-094927494
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Official Citation:Yoshito H. Ono, Carlos M. Correia, Dave R. Andersen, Olivier Lardière, Shin Oya, Masayuki Akiyama, Kate Jackson, Colin Bradley; Statistics of turbulence parameters at Maunakea using the multiple wavefront sensor data of RAVEN. Mon Not R Astron Soc 2017; 465 (4): 4931-4941. doi: 10.1093/mnras/stw3083
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:75571
Deposited By: George Porter
Deposited On:31 Mar 2017 17:02
Last Modified:03 Oct 2019 16:51

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