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Question: Aurora, fluctuations, which time scale?
Posted: Mon Sep 08, 2008 6:18 pm
by henk21cm
G'day folks,
Yesterday evening (20080907) the BBC had a topic about Norway and Svalbard. Some images of aurora were shown. From the images one could not get an good idea of the time scale of the fluctuations, since the images could have been sped up considerably. The aurora looked like curtains slowly waving in a gentle breeze. Since i have never seen aurora with my own eyes, my question is:
How fast is aurora changing?
Posted: Tue Sep 09, 2008 7:13 pm
by makc
http://www.youtube.com/watch?v=icugqEEOgkg
Most of the individual clips here were each taken over about a 10 minute period to give you an idea of how much they were moving in real time.
Time scale of aurora?
Posted: Tue Sep 09, 2008 9:24 pm
by henk21cm
Unfortunately i can not display these clips, since they are Flash format. Is it safe to assume that 1 minute is the time scale of the fluctuations?
Posted: Tue Sep 09, 2008 10:49 pm
by Doum
From what i saw here in the north. It always depend of the solar flare coming from the sun. Some change in 30 sec, other in 2 to 5 minutes. I saw many that move from north to south over my head withinh a few second. Extremely impressive. Twas all white light and it must have been a very big solar flare. The entire sky was moving (The light i mean)(Many different flash). Saw that once in my life. So henck, it usualy move slowly. Minutes or half minute. It depend of how someone see it. Time is subject to people estimation wich differ from one another. Ohhh by the way, beer also influence the pass of time.
Re: Time scale of aurora?
Posted: Wed Sep 10, 2008 5:01 am
by makc
henk21cm wrote:Unfortunately i can not display these clips, since they are Flash format.
Are you on linux or something? Use
this site to download stuff from youtube, and then
this player to play it.
Time scale of fluctuations in Aurora
Posted: Wed Sep 10, 2008 8:27 pm
by henk21cm
Doum wrote:Some change in 30 sec, other in 2 to 5 minutes.
With the help of
makc and
Doums description i know now that the images the BBC was showing, were probably real-time. Sometimes processes are shown in a 'fast forward' pace, like clouds speeding in the sky.
_______________
Thanks.
Henk
Posted: Thu Sep 11, 2008 6:02 am
by makc
ha. now where was that funny story about blind man, who was asking what something looks like... cozz I still do not know
