11/29: Upper Tangent Arc

Undertoad • Nov 29, 2001 1:03 pm
Image

This is another solar phenomenon that is not aliens. It's called an "upper tangent arc". It happens when "cirrus clouds contain columnar ice crystals aligned so that their axes are all in a horizontal direction". Got it.

This is always about 22 degrees away from the Sun itself. This particular image also has a bit of "sun pillar" which was an iotd a few days ago.
dave • Nov 29, 2001 2:00 pm
I can honestly say that I've never seen one of those :) but I'd really like to see a sun pillar. That would be cool.

Honestly though... the Northern Lights are about the coolest looking things ever :)
warch • Nov 30, 2001 11:02 am
The northern lights have been really active and gorgeously glowy this fall around here- (MN) then those Leonids- How cool was that?! (pretty damn cool)
dave • Nov 30, 2001 11:03 am
Lucky you. I'd kill my mother to see them. Not really. But still. Wow. Being down in Virginia though... :)
warch • Nov 30, 2001 11:17 am
Until this year I had never really seen anything too dramatic- sun dogs, a few greeny gold streaks, a bit of a ripple to the north. But this past Oct, my neighbor wrangled our block outside and it was red and pulsing- Waaahhh:eek: Makes me want to roadtrip even further north- Flin Flon?
dave • Nov 30, 2001 11:20 am
Word has it that anything in Alaska is pretty spectacular. I have some bookmarked sites at home with some really awesome pictures that I'll post some time. Man. Amazing.
elSicomoro • Nov 30, 2001 5:46 pm
This site has some great pics of the Northern Lights.
dave • Nov 30, 2001 5:56 pm
Originally posted by sycamore
This site has some great pics of the Northern Lights.


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serge • Dec 1, 2001 8:49 pm
Originally posted by dhamsaic


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Google is your friend.
elSicomoro • Dec 1, 2001 10:18 pm
Originally posted by dhamsaic


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*shrugs* It works for me...