The unusual STEVE auroral arc across the northern sky at Bow Lake, Banff National Park, Alberta on the night of July 16-17, 2018. The more normal green auroral arc is lower across the northern horizon. But STEVE here appears more pink. The STEVE aurora was colourless to the eye but did show faint fast-moving rays, here blurred by the long exposure. They were moving east to west. The Big Dipper is at left. The lights are from Num-Ti-Jah Lodge. This is a single exposure for the sky and a mean-stacked blend of 3 exposures for the ground to smooth noise. All 15 seconds at f/2 with the Sigma 20mm Art lens and Nikon D750 at ISO 6400.
The Big Dipper over the iconic Castle Mountain in Banff National Park, Alberta, with a backdrop of a faint aurora in the northern sky. This was at 3 am on July 16, 2018, and taken from the Castle Cliffs viewpoint on the Bow Valley Parkway. The sky was also brightening with dawn twilight blue. This is a stack of 8 exposures for the ground, mean combined to smooth noise, and one exposure for the sky. All 30 seconds at f/2 with the Sigma 24mm Art lens, and Nikon D750 at ISO 3200. LENR dark frame subtraction applied in camera.
The Big and Little Dippers, and Polaris, over Castle Mountain in Banff National Park, with the scene lit by starlight. A faint aurora adds the sky colour, as does the oncoming morning twilight. This is a 3-segment vertical panorama, each 30 seconds at f/2 with the Sigma 24mm lens and Nikon D750 at ISO 3200. Stitched with Adobe Camera Raw.
