CDROM/AJ/V114/P2822     Seeing Tests for NPOI Project (Hutter+ 1997)
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Seeing Tests At Four Sites in Support of the NPOI Project
      D.J. Hutter, N.M. Elias II, E.R. Peterson, W.B. Weaver, G. Weaver,
      D. Mozurkewich, F.J. Vrba, R.S. Simon, D.F. Buscher, C.A. Hummel
      <1997, AJ, 114, 2822>
      =1997AJ....114.2822H
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Abstract:
  This paper reports astronomical seeing measurements made at four sites
  in the western United States during 1991-92. This study was conducted
  as part of the site selection process for the Navy Prototype Optical
  Interferometer. An extensive series of observations were made at Chews
  Ridge and Anderson Ridge, CA (~36,000 equivalent FWHM seeing
  estimates). Observations made from Chews Ridge over 49 nights yield an
  average FWHM seeing value of ~ 1.1", while those made from Anderson
  Ridge over 34 nights yield an average FWHM seeing of ~ 1.4". However,
  observations made from Anderson Ridge at a location away from any
  nearby trees indicate that more open sites in that area may enjoy
  seeing comparable to that measured at Chews Ridge. Simultaneous
  free-air, ground-level observations at the U.S. Naval Observatory's
  Flagstaff Station and at Anderson Mesa, both near Flagstaff, AZ, yield
  similar seeing values to each other (<= 0.1" difference).

Description:
  The individual files are named in the format: ddmmyyT.asc, where dd = UT
  date, mm = month, yy = year, and T = telescope (a = 'Unit A' seeing
  monitor, b = 'Unit B' seeing monitor, and v = 1.55 m NOFS telescope  --
  as described in the paper).  Each file contains three columns of data.
  See the byte-by-byte description for the formats and physical units.

Byte-by-byte Description of file: *.asc
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   Bytes Format  Units      Label      Explanations
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   1- 9   F9.6   h          UTC        UTC time of the observation
  10-19   F10.6  deg        Gamma      Zenith angle of the observation
  20-28   F9.6   arcsec     Seeing     Full-width-at-half-maximum (FWHM) seeing
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(End)                                             Lee Brotzman [ADS] 04-Nov-1997