Skip to comments.Astronomy Picture of the Day -- Reflected Aurora Over Alaska
Posted on 02/12/2013 4:14:48 AM PST by SunkenCiv
Explanation: Some auroras can only be seen with a camera. They are called subvisual and are too faint to be seen with the unaided eye. In the above image, the green aurora were easily visible to the eye, but the red aurora only became apparent after a 20-second camera exposure. The reason is that the human eye only accumulates light for a fraction of a second at a time, while a camera shutter can be left open much longer. When photographing an already picturesque scene near Anchorage, Alaska, USA, last autumn, a camera caught both the visual green and subvisual red aurora reflected in a lily pad-covered lake. High above, thousands of stars were visible including the Pleiades star cluster, while the planet Jupiter posed near the horizon, just above clouds, toward the image right. Auroras are caused by energetic particles from the Sun impacting the Earth's magnetosphere, causing electrons and protons to rain down near the Earth's poles and impact the air. Both red and green aurora are typically created by excited oxygen atoms, with red emission, when visible, dominating higher up. Auroras are known to have many shapes and colors.
(Excerpt) Read more at 126.96.36.199 ...
Well, I learned something new today.
I had NO idea there were water lilies in Alaska.
Well, it was “summertime” up there 8<)
No snow. Check.
Melted, calm water. Check.
No snow. Check.
A billion mosquitoes. Check.
And the next billion. Check.
And the next billion. ....
And the livin’ is EEEEEEzee.......
Its a great photo but I’d be kicking myself for leaving the lights on behind me.
In mid-winter no less!
Wasn’t winter yet, it was autumn.
I love this picture, Sunky! Looks like something out of a story book. So magical! Thanks!
Does that photo rake a (very large) “Hoe, Hoe, Hoe” from the judges, or did you farm it out to someone else?
Being in Alaska since 1992 that looks fake.
Photoshop postcard maybe for the tourists.
Very nice. Worth a trip to the APOD site to see the names of the stars and constellations pictured. Wonderful job again, Mr. Civilizations.
Woah! Looks like a really well done Thomas Kinkade!
Dare ya to put your tongue on one of the petals! ;’)
Is that a double dog dare?
Disclaimer: Opinions posted on Free Republic are those of the individual posters and do not necessarily represent the opinion of Free Republic or its management. All materials posted herein are protected by copyright law and the exemption for fair use of copyrighted works.