| Summary: | Spectral irradiance time series measured north of Rijpfjorden, Svalbard (80° 37.79N 22° 4.14E) on January 15, 2017 over midday period. (a) Solar (black) and lunar (red) altitude during measurements. Lunar phase was a waning gibbous moon, full on January 12. (b) Ratio of 492 nm (solar/lunar light at sensitivity maximum of krill) [ 1 ] and both the 557 nm (green) and 630 nm (red) aurora lines [ 2 ]. (c) Time series of E PAR (400 to 700 nm; upper panel) and 492 nm, 557 nm, and 630 nm light (lower panel). (d) Spectral irradiance at 3 time points during the time series shown in (c); with a running mean and 492 nm peaks (black lines), and aurora lines at 557 nm and 630 nm plotted green and red, respectively. For data, see S1 Data . (DOCX)
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