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Table 2

List of all observations shown in this work along with parameters and geophysical conditions. This selection represents a subset of our database, pertinent with our understanding and conclusions. “Alm” stands for “Almucantar” which is a circle of constant elevation in the sky. In this case, we simply perform a full rotation at a constant elevation. f10.7 and Ap values are taken respectively from the Space Weather Canada ( and the International Service of Geomagnetic Indices websites ( The last column (Atmospheric conditions) is based on our eye observations, on the all-sky camera archives available here:, on the local weather bulletins and when available on the analysis of the local lidar in Ny Alesund.

# Date (March 2019) Location Time (UT) Length Wavelength (nm) Azimut (°) Elevation (°) f10.7 (sfu) Ap Atmospheric conditions
A 7th Skibotn 18:46 1 h 08 630.0 164 45 69.9 12 Clear sky, auroral activity
B 20:34 30 min 557.7
C 21:09 46 min 427.8
D 23:14 50 min 391.4
E 8th Skibotn 20:37 29 min 557.7 164 45 70.7 2 Cloudy, no auroral activity
F 3rd Ny Alesund 22:03 45 min 630.0 Alm 30 69.2 7 Clear sky, small auroral activity
G 8th Skibotn 02:12 7 min 427.8 Alm 45 68.9 12 Clear sky, small auroral activity
H 9th 21:47 7 min 69.7 9 Cloudy, no auroral activity
I 8th Skibotn 00:32 7 min 391.4 Alm 45 68.9 12 Clear sky, auroral activity

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