1 The University Centre in Svalbard (UNIS), N-9171 Longyearbyen, Norway 2 Magnetosphere Ionosphere Research Lab, University of New Hampshire, USA 3 Keo.

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Presentation transcript:

1 The University Centre in Svalbard (UNIS), N-9171 Longyearbyen, Norway 2 Magnetosphere Ionosphere Research Lab, University of New Hampshire, USA 3 Keo Scientific Ltd., Calgary, Alberta, Canada 4 Swedish Institute of Space Physics, Kiruna, Sweden 5 Department of Physics, University of Oslo, Oslo, Norway. 6 Polar Geophysical Institute, Murmansk Region, Apatity, Russia 7 Geophysical Institute, University of Alaska, Fairbanks, USA Auroral All-Sky Camera Calibration Fred Sigernes 1*, Drummond Biles 2, Henrik Bjørklund 1, Dag Lorentzen 1, Trond Trondsen 2, Urban Brändström 3, Espen Trondsen 4, Bjørn Lybekk 4, Jøran Moen 4, Sergey Chernouss 5 and Charles Deehr 6 * Birkeland Center for Space Science

CONTENT 1.BASIC PRINCIPLE 2.EXPERIMENTAL SETUP 3.TEST OF CALIBRATION 4.CAMERA EQUATIONS 5.RESULTS 6.CONCLUSION F. Sigernes et al., Auroral All-Sky Camera Calibration, 40 AM

1. BASIC PRINCIPLE

F. Sigernes et al., Auroral All-Sky Camera Calibration, 40 AM Experimental setup at UNIS optical lab: (1) Labsphere 1m diameter integrating sphere, (2) source lamp sphere, (3) Oriel 45W tungsten Lamp (FEL), (4) fiber bundle probe, (5) Oriel FICS spectrograph, (6) rail road, (7) Keo Alcor-RC lamp, (8) Lambertian screen, (9) adjustable table on rails, and (10) table jacks. 2. EXPERIMENTAL SETUP

Integrating sphere camera setup.Sphere images. (A) No source block and (B) moon block. 2. EXPERIMENTAL SETUP

F. Sigernes et al., Auroral All-Sky Camera Calibration, 40 AM Keo Alcor-RC. Remote Controlled Low Brightness source from Keo Scientific (head unit). Keo User Manual: «It consists of the lamp, aperture wheels, various diffusing elements, and electronics required to remotely control the system.» In addition: 1) Agilent E3633A power supply 2) Alcor-RC power supply 3) Control software 4) Calibration Certificate (NRC) 5) HP mini PC (not included) 3. TEST OF CALIBRATION

F. Sigernes et al., Auroral All-Sky Camera Calibration, 40 AM 3. TEST OF CALIBRATION Keo Alcor RC Aperture [%] Relative Integrated Percentage Error Keo & FICS[%]

F. Sigernes et al., Auroral All-Sky Camera Calibration, 40 AM 4. CAMERA EQUATIONS Camera raw counts (x,y) of screen For auroral emissions Assumes that the source B, lens transmissions and detector sensitivity varies slowly in the wavelength interval 

F. Sigernes et al., Auroral All-Sky Camera Calibration, 40 AM 4. CAMERA EQUATIONS Transform from (x,y) to (R,  ) Due to uniform B and symmetry, a functional fit u=u(  ) should work

F. Sigernes et al., Auroral All-Sky Camera Calibration, 40 AM 4. RESULTS

4. CONCLUSION F. Sigernes et al., Auroral All-Sky Camera Calibration, 40 AM A two-step method to calibrate and flat-field correct an all-sky camera is outlined: 1.The center pixel spectral sensitivity is obtained and tested by a traditional method including a flat Lambertian screen and a 45W tungsten lamp. 2.Flat-field correction or off-axis response is conducted by the use of a modified l m diameter integrating sphere. The net result is that it is sufficient with only 6 parameters per channel to calibrate an all-sky camera.