J/A+A/549/A8    Atmospheric extinction properties above Mauna Kea (Buton+, 2013)
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Atmospheric extinction properties above Mauna Kea from the Nearby Supernova
Factory spectro-photometric data set.
    Buton C., Copin Y., Aldering G., Antilogus P., Aragon C., Bailey S.,
    Baltay C., Bongard S., Canto A., Cellier-Holzem F., Childress M.,
    Chotard N., Fakhouri H.K., Gangler E., Guy J., Hsiao E.Y., Kerschhaggl M.,
    Kowalski M., Loken S., Nugent P., Paech K., Pain R., Pecontal E.,
    Pereira R., Perlmutter S., Rabinowitz D., M.Rigault, Runge K., Scalzo R.,
    Smadja G., Tao C., Thomas R.C., Weaver B.A., Wu C.,
    The Nearby Supernova Factory
   <Astron. Astrophys. 549, A8 (2013)>
   =2013A&A...549A...8B
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ADC_Keywords: Extinction ; Spectrophotometry
Keywords: atmospheric effects - instrumentation: spectrographs -
          methods: observational - techniques: imaging spectroscopy

Abstract:
    We present a new atmospheric extinction curve for Mauna Kea spanning
    3200-9700{AA}. It is the most comprehensive to date, being based on
    some 4285 standard star spectra obtained on 478 nights spread over a
    period of 7 years obtained by the Nearby SuperNova Factory using the
    SuperNova Integral Field Spectrograph. This mean curve and its
    dispersion can be used as an aid in calibrating spectroscopic or
    imaging data from Mauna Kea, and in estimating the calibration
    uncertainty associated with the use of a mean extinction curve. Our
    method for decomposing the extinction curve into physical components,
    and the ability to determine the chromatic portion of the extinction
    even on cloudy nights, is described and verified over the wide range
    of conditions sampled by our large dataset. We demonstrate good
    agreement with atmospheric science data obtain at nearby Mauna Loa
    Observatory, and with previously published measurements of the
    extinction above Mauna Kea.

Description:
    SNfactory median atmospheric extinction [mag/airmass] and its
    decomposition into physical components (Ozone, Aerosol optical depth
    and Aerosol Angstroem exponent) from 3200{AA} to 10000{AA} (2{AA}
    bins).

File Summary:
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 FileName   Lrecl  Records   Explanations
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ReadMe         80        .   This file
snfext.dat     69     3551   Atmospheric extinction at Mauna Kea
snfext.fits  2880       28   FITS file for atmospheric extinction
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See also:
   J/A+AS/109/293   : Heterochromatic extinction. I. (Grebel+, 1995)
   J/A+AS/109/313   : Heterochromatic Atmospheric Extinction (Roberts+, 1995)
   J/other/JAD/18.3 : Infrared extinction spectra of aerosols (Sterken+, 2012)

Byte-by-byte Description of file: snfext.dat
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   Bytes Format Units   Label     Explanations
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   2- 13  E12.8 0.1nm   lambda    Wavelength ({AA})
  16- 27  E12.8 mag     Ext       Median atmospheric extinction,
                                   in mag/airmass unit
  30- 41  E12.8 mag     kR        Rayleigh scattering, in mag/airmass unit
  43- 55  E13.8 mag     kO3       Ozone scattering, in mag/airmass unit
  58- 69  E12.8 mag     ka        Aerosols scattering, in mag/airmass unit
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Acknowledgements:
    C. Buton, cbuton(at)me.com

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(End)        C. Buton [Universitaet Bonn], Patricia Vannier [CDS]    05-Oct-2012
