Sodankylä Geophysical Observatory

SGO Optical Instrumentation

SGO optics

SGO has four independent optical instruments in operation:

In addition, SGO hosts optical guest instruments at SOD:

  • UCL Fabry-Perot Interferometer 2003- , contact: PI Anasuya Arualiah, APL, University College London, UK
  • UCL All-Sky Colour Imager 2003- ,contact: PI Anasuya Arualiah, APL, University College London, UK
  • ISEE 100Hz All-Sky imager 2016-, contact Dr. Shin-Ichiro Oyama, ISEE, University of Nagoya, Japan
  • NIPR 10Hz All-Sky imager 2016-, contact : Dr. Yasunobu Ogawa, National Institute of Polar Research, Japan

The SGO All-Sky Cameras (iCCD and emCCD) are part of the MIRACLE network. Operation starts in late August - early September when the nights start to be dark enough to observe the Northern Lights. The season ends in mid-April when the bright nights arrive. The iCCD and emCCD cameras operate when the Sun is at least 10 degrees below the horizon. Both cameras operates MIRACLE sequencies.

  • iCCD camera at SOD takes photos through the green filter (557nm) every 20 seconds and trough the red (630nm) and blue (428nm) filters once per minute. In addition, the camera takes "white images" (2s exposure without any filter) every 15 minutes. ASC imagers are calibrated in FMI calibration laboratory once per year usually in the context of the Nordic optical intercalibration session.

    Overview data are presented as keograms and time-lapse movies. SGO iCCD and emCCD keograms and timelapse movies are available online in the SGO data archive. Latest keograms of the MIRACLE stations are available on the MIRACLE pages . MIRACLE keograms are uploaded to the MIRACLE page every working day morning (excluding holidays). SGO's own keogram archive and ASC movies are updated periodically.

    The Atmospheric Physics Laboratory of the University College of London have a all sky colour imager next to their Fabry-Perot interferometer. The camera takes a snapshot of the sky every 2 minutes. The exposure time is 30 seconds. Sometimes, especially during full Moon, there are reflections of the Fabry-Perot mirrors in the images. Since Jan 2017 there has been AuroraTech Cloud sensor next to UCL dome. SGO only represent realtime images of the data. All requests of use of data should be pointed to APL, UCL.

    The Institute for Space-Earth Environmental Research (ISEE), University of Nagoya, Japan, operates 100Hz emCCD imager at SOD. It is one of four high speed all-sky cameras located to Scandinavia. The research interest is flickering auroras. The sites were selected for best conjuctions of the Japanese Arase (ERG) satellite. The dome structure for the camera was developed by SGO technical laboratory. There are also two 10Hz all-sky imagers from National Institute of Polar Research, Japan.


  • Last modified: 30 April 2021, 06:18:49.