Really strong red airglow among with the gravity waves appeared in the sky over Northern Jutland as the darkness arrived. I suppose, this is the result of the weak Auroral substorm, as the the local K-index was around 4 - sight of the Northern Lights was reported just 60 km North from the place I was at, you can see some green color on the horizon on the last image. Follow me for more astrophotography: @astrorms
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