NLCs from Alberta
Taken by Alan Dyer on June 17, 2019 @
near Gleichen, Alberta
Click photo for larger image
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Camera Used: SONY ILCE-7M3
Exposure Time: 4/1
Aperture: f/1.0
ISO: 400
Date Taken: 2019:06:18 10:20:43
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Details:
We had some fine NLCs June 17 over southern Alberta, but they were somewhat unusual in that they appeared far to the west-northwest, more so than I can remember seeing them.
NLCs usually appear low across the north, at an azimuth of usually no more than 30° to the east or west. This display was a good 60° west of due north.
They appeared as the twilight deepened about 11:15 pm MDT but faded with the decreasing Sun angle and were gone by midnight. They didn't pick up again to the north, so despite being only a few days from solstice the sunlight was not able to reach whatever mesospheric clouds might have existed directly north of us. Might that be due more to tropospheric clouds over the high Arctic or North Pole region blocking the light path to mesospheric clouds over northern Canada?
It's always a mystery why we see displays some nights and not others despite similar conditions locally.
Photographer's website:
http://www.amazingsky.com
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