Early White Christmas Photos

Non-political secular news and anything else (within the boundaries of Christian morality and good taste) that is not on-topic in any other section. Any politically charged material must be posted in the private Political and Social Issues forum; please PM admin for access. All Forum Rules apply. No polemics. No heated discussions. No name-calling.
Post Reply
User avatar
Maria
Archon
Posts: 8428
Joined: Fri 11 June 2004 8:39 pm
Faith: True Orthodox Christian
Jurisdiction: GOC
Location: USA

Early White Christmas Photos

Post by Maria »

Image

"Polar night is coming to the subarctic," reports Mia Stålnacke of Kiruna, Sweden, just inside the Arctic Circle. ... Stålnacke's long exposure captured not only the Milky Way looming over Kiruna, but also a beautiful splash of green. Inside the Arctic Circle, green is normally a sign of geomagnetic activity--that is, the aurora borealis. "But this was no aurora," she says. "It's airglow."

Airglow is a chemical reaction involving oxygen in the upper atmosphere driven in part by solar ultraviolet radiation and cosmic rays. Visibility waxes and wanes with conditions such as pressure and temperature in the rarified air more than 90 km above Earth's surface. Gravity waves traveling up from the planet below impress the verdant glow with a dramatic rippling structure.

Dark nights with a new or thin crescent Moon are the best times to catch a glimpse of airglow. Often, the glow is dim and pale to the naked eye, revealing its green color only to the lens of cameras set for Milky Way-length exposures. Seeing airglow above the Arctic Circle is even more challenging as it is frequently overwhelmed by the brighter glow of auroras.

http://www.spaceweather.com/archive.php ... &year=2016

Lord Jesus Christ, have mercy on me a sinner.

Post Reply