University College London
Atmospheric Physics Laboratory
ESRANGE
Kiruna
SGO
Sodankylä
KHO
Svalbard
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KEOPS (Kiruna Esrange Optical Platform Site)
Esrange, Kiruna, Sweden
All-Sky camera and cloud sensor
Starlight Xpress Trius SX-674C, Fujinon FE185C057HA-1 fisheye lens
Aurora Eurotech Cloud Sensor
Clarity = (sensor temperature – sky temperature)