University College London
Atmospheric Physics Laboratory
ESRANGE
Kiruna
SGO
Sodankylä
KHO
Svalbard
FPI DATA
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Kjell Henriksen Observatory, Breinosa, Longyearbyen, Svalbard
All-Sky camera and cloud sensor
Starlight Xpress SXV-H9C, Fujinon FE185C057HA-1 fisheye lens
Aurora Eurotech Cloud Sensor
Clarity = (sensor temperature – sky temperature)