Aurora and the Old Farm Truck


An aurora display on the night of June 7/8, 2015 from southern Alberta, with an old rustic farm truck as the foreground. This is a frame from a 450-frame time-lapse with the Nikon D750 at ISO 1600 and the Sigma 24mm lens at f/2.8, for 8 seconds each. The foreground is from a stack of 8 images adjacent in time to the sky image stacked in Mean mode for smoothing of noise.

The northern lights returned to our prairie sky in a colourful display near solstice.

Last night, Sunday, June 7, I headed out to a nearby abandoned farmyard to shoot the planets setting into the western twilight. But as the sky darkened the faint arc of an aurora appeared to the northeast, promising a fine show after midnight.

Sure enough, as the sky got dark, which doesn’t happen until very late now at 50° north in mid-June, the aurora began to dance.

The top image is a frame from the display at its best. It is one of 400 frames I shot for a time-lapse sequence.

An aurora display on the night of June 7/8, 2015 from southern Alberta, with an old rustic farm truck as the foreground. This is a frame from a 450-frame time-lapse with the Nikon D740 at ISO 1600 and the Sigma 24mm lens at f/2.8, for 8 second each. The foreground is from a stack of 8 images adjacent in time to the sky image stacked in Mean mode for smoothing of noise.

This image is from the start of the sequence, just as the aurora was beginning to get good, with curtains of green laced with tints of magenta and purple. At this time of year the tops of the curtains often look blue, as they scatter direct sunlight streaming over the pole.

However, the colours were not visible to the unaided eye — only the camera brought out the colours, as this display never got intensely bright to the eye.

An aurora display on the night of June 7/8, 2015 from southern Alberta, with an old rustic farm truck as the foreground. This is a frame from a 450-frame time-lapse with the Nikon D740 at ISO 1600 and the Sigma 24mm lens at f/2.8, for 8 second each. The foreground is from a stack of 8 images adjacent in time to the sky image stacked in Mean mode for smoothing of noise.

Toward the end of the sequence the display began to spread out, becoming patchy and less colourful, a typical behaviour after a substorm outburst.

More activity may be in store this week. So keep looking up! And check Spaceweather.com for alerts.

— Alan, June 8, 2015 / © 2015 Alan Dyer / www.amazingsky.com