Amazing Sky Videos

My short 1.5-minute music video captures the aurora display of Friday the 13th, 2017 from southern Alberta in time-lapse sequences shot at a high cadence rate.

It is rendered in true 4K resolution.

The exposures were each 3 seconds at f/2 with 24mm and 14mm Sigma Art lenses and with a Nikon D750 at ISO 6400. The interval was 1 second. In rendering the sequences I applied a 4-frame blur to smooth the flow of the auroral curtains to make the time-lapse look more like a real-time video, though greatly sped up.

The sequences run from 11:30 p.m. MDT to 1:00 a.m., and are made of 1352 frames.

The video nicely demonstrates the typical development of an aurora, beginning first as a quiescent arc across the north.

Then a sub-storm hits and the arc breaks up into active curtains dancing, but with a general east-to-west flow.

The curtains then break up into a more chaotic post-sub-storm flickering and pulsing, and in this case also with large diffuse patches above rapidly turning on and off. These patches were not visible to the eye, but the camera recorded them, These flickering patches had a more blue-green tint, compared to the more yellow-green colour of the main curtains with their typical red and magenta tops. Occasionally, the curtains exhibit a pink lower fringe.

The green and red colours of the main curtains are from excited oxygen (O) atoms. Their pink lower fringe is from nitrogen (N2) molecules.

But the colours of the diffuse patches might be from single nitrogen (N) atoms and 02+ ions. But that’s a guess on my part, judged only by the deeper green of their tint, which matches the typical spectra of these atoms and molecules.

The infamous "STEVE" arc did not appear this night.

# vimeo.com/238450470 Uploaded 899 Views 0 Comments

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Amazing Sky Videos

Alan Dyer Plus

A collection of videos of astronomical time-lapse movies and still images by Alan Dyer. Check out my ebook on "How to Photograph & Process Nightscapes and Time-Lapses" at amazingsky.com/nightscapesbook.html. Please drop by my blog at amazingsky.net…


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A collection of videos of astronomical time-lapse movies and still images by Alan Dyer. Check out my ebook on "How to Photograph & Process Nightscapes and Time-Lapses" at amazingsky.com/nightscapesbook.html. Please drop by my blog at amazingsky.net for more images and stories. My main searchable galleries of still images are at amazingsky.photoshelter.com. Thanks for looking!

Shout Box

  • Alan Dyer

    I added a new video of the Transit of Mercury from November 11, 2019.

    by Alan Dyer

  • Alan Dyer

    The lead video is a time-lapse of noctilucent clouds shot June 19.

    by Alan Dyer

  • Alan Dyer

    My latest video features real-tome auroras shot from the ship the ms Trollfjord along the coast of Norway in early March 2019.

    by Alan Dyer

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