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Geoscientific Instrumentation, Methods and Data Systems An interactive open-access journal of the European Geosciences Union
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Volume 3, issue 2
Geosci. Instrum. Method. Data Syst., 3, 241-245, 2014
https://doi.org/10.5194/gi-3-241-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.
Geosci. Instrum. Method. Data Syst., 3, 241-245, 2014
https://doi.org/10.5194/gi-3-241-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 10 Dec 2014

Research article | 10 Dec 2014

Auroral all-sky camera calibration

F. Sigernes1,*, S. E. Holmen1,*, D. Biles2, H. Bjørklund1, X. Chen1,*, M. Dyrland1,*, D. A. Lorentzen1,*, L. Baddeley1,*, T. Trondsen3, U. Brändström4, E. Trondsen5, B. Lybekk5, J. Moen5, S. Chernouss6, and C. S. Deehr7 F. Sigernes et al.
  • 1University Centre in Svalbard, Longyearbyen, Norway
  • 2Magnetosphere Ionosphere Research Lab, University of New Hampshire, USA
  • 3Keo Scientific Ltd, Calgary, Alberta, Canada
  • 4Swedish Institute of Space Physics, Kiruna, Sweden
  • 5Department of Physics, University of Oslo, Oslo, Norway
  • 6Polar Geophysical Institute, Murmansk Region, Apatity, Russia
  • 7Geophysical Institute, University of Alaska, Fairbanks, USA
  • *also at: Birkeland Centre for Space Science, University of Bergen, Bergen, Norway

Abstract. A two-step procedure to calibrate the spectral sensitivity to visible light of auroral all-sky cameras is outlined. Center pixel response is obtained by the use of a Lambertian surface and a standard 45 W tungsten lamp. Screen brightness is regulated by the distance between the lamp and the screen. All-sky flat-field correction is carried out with a 1 m diameter integrating sphere. A transparent Lexan dome at the exit port of the sphere is used to simulate observing conditions at the Kjell Henriksen Observatory (KHO). A certified portable low brightness source from Keo Scientific Ltd was used to test the procedure. Transfer lamp certificates in units of Rayleigh per Ångstrøm (R/Å) are found to be within a relative error of 2%. An all-sky camera flat-field correction method is presented with only 6 required coefficients per channel.

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A two-step procedure to calibrate the spectral sensitivity of auroral all-sky (fish-eye) cameras is outlined. First, center pixel response is obtained by the use of a Lambertian surface and a standard tungsten lamp. Second, all-sky flat-field correction is carried out with an integrating sphere.
A two-step procedure to calibrate the spectral sensitivity of auroral all-sky (fish-eye) cameras...
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