Taken by Matthew Wheeler on April 10, 2018 @ Robson Valley BC Canada
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Exposure Time: 25/10
Aperture: f/2.8
ISO: 5000
Date Taken: 2018:04:10 23:46:04
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Just after midnight local time April 10 I went outside to see how the aurora was developing (featureless green glow to north) and immediately saw a thin, bright pink line overhead spanning to NW and SE horizons. Without dark adapted eyes it was easy to see right away the textures moving at astonishing speed to the NW. My dog barked at it for most of the whole hour it was visible. The path remained almost in the same place for the hour, as it has since I first noticed it over this valley in the 1980s. But character changed from ragged to smooth, and pink to mostly green. Photos sample a range of the early event. Faded by 08 UT, but apparent motion was still fast as textures went overhead. Time for pink features to span Big Dipper end to end was about 9 seconds. Green pickets moved much slower. Nikon D7200 with f2.8 lens set 14 to 16mm. First photo 5000 iso, 2.5 sec. Others 10000 iso, 3 sec.
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