Fig. 16From: A new five-wavelength photometer operated in Tromsø (69.6°N, 19.2°E)All-sky images taken with a digital camera (Nikon D7200) every 30 s with exposure time of 8 s between 19:43:10 UT and 19:44:40 UT on January 22, 2018. The field-aligned position, where the photometer was pointed, was indicated by a red plus sign (+)Back to article page