Aurora Over Threave Castle (Alistair Scobie)

Contains: Northern lights

Aurora Over Threave Castle

This is my capture of the Aurora over Threave Castle, Dumfries & Galloway in SW Scotland on 18th September 2023.
It was captured using an Olympus E-M1 mkiii camera at 12mm focal length.
ISO 1600 with a 40 second exposure at f/2.8 was used for the scene from which the stars were removed and added back using a second 10 second exposure.
The recorded sensor temperature was 21°C.

According to the Canadian Space Agency, the following colours can be seen when the northern lights are in the sky.

Green: Green is the most common colour seen from the ground and is produced when charged particles collide with oxygen molecules at altitudes of 100 to 300 km.
Pink and dark red: Occasionally, the lower edge of an aurora will have a pink or dark red fringe, which is produced by nitrogen molecules at altitudes of around 100 km.
Red: A bit higher in the atmosphere (at altitudes of 300 to 400 km), collisions with oxygen atoms produce red auroras.
Blue and purple: Finally, hydrogen and helium molecules can produce blue and purple auroras, but these colours tend to be difficult for our eyes to see against the night sky.

I suppose that at a latitude of 54N, the aurora is actually a good way to the north and so the green portion appears low in the sky.

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