SGO emCCD Instrumentation and data

The SGO emCCD imager is all sky camera based on the Andor XU-888 emCCD imager with filter wheel with 8 positions built by Keo Scientific Ltd, Canada. The camera was purchased in 2007. The camera was first operated from 2007 to 2012 parallel to SGO iCCD camera, which was used for synoptic auroral observations over 20 years. From 2013 onwards the camera has been operated at Abisko, where it has had better overlapping with the identical all-sky imager owned by Finnish Meteorological Institute. The cameras are run in bistatic mode and special campaigns can be requested.

Overview of emCCD data set is presented as keograms and time-lapse movies, which are available online in the SGO data archive.

The emCCD camera are part of the MIRACLE network, running the MIRACLE sequences:

• the green filter (557nm) at 00,05,10,20,25,30,40,45,55
• the red filter (630nm) at 15, 35
• the blue filter (428nm) at 00,05,25,40,45,55
• unfiltered "white image" at 35
• dark image for noise calibration at 50
• background filters for RBG once per minute

When, multiple filters have same nominal time the images are taken after each other.
The gain of the EMCCD camera is changed according to Moon phase.
Special bistatic campaigns with FMI imager at Kilpisjärvi can be requested.

SGO emCCD imager are calibrated in FMI calibration laboratory annual base expect year 2020 and 2021 due to COVID-19 restrictions