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Post by drewster327 on Jul 24, 2009 5:49:04 GMT
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Post by markt on Jul 24, 2009 6:02:15 GMT
Those shots are stunning!  |
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Post by mherbert on Jul 24, 2009 6:03:48 GMT
Fantastic photos Mike |
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Post by drewster327 on Jul 24, 2009 6:11:35 GMT
Thanks guys! Here is one more for now  |
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Post by markt on Jul 24, 2009 8:15:37 GMT
Worth a thought, anyway! The Schroder/Gadsden book shows some relationship, but it's a very complex, variable relationship! J. Care to elaborate? You've got me intruiged now...  |
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Post by tmcewan on Jul 24, 2009 13:14:36 GMT
A mini-meta analysis of what work existed back in the 70s/80's showed a relationship that depended on whether the observer was located in Europe, or in North America. That would seem to hint at the geomagnetic pole's position relative to the observer making a difference to the effect. Isn't this simply the result of where higher geomagnetic latitudes are located at favourable NLC latitudes, giving NLC observers in northern USA and Canada an enviable advantage when it comes to seeing simultaneous displays of NLC and aurora? Here in Scotland I've only been lucky enough to observe this on one occasion - and that's over 24 seasons. The phenomenon is reported from Canada most years. Tom |
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Post by markwalters on Jul 24, 2009 17:33:14 GMT
So that's where the NLC's went last night ! Those are fantastic shots Drewster
Mark
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Post by tmcewan on Jul 24, 2009 18:21:04 GMT
Yes, I've read the relevant passages on this but find it almost impossible to draw any firm conclusions from it - indeed, the authors readily admit as much in their summary.
My own direct observations have been entirely inconclusive: I've observed bright, vigorous aurora fade with NLC later forming, or, not forming; bright NLC fading with aurora then appearing, or, not appearing; aurora and NLC together with no unusual change to the NLC, and, bright NLC present with no visible aurora during sustained (2-3 days) periods of high Kp values.
This is an interesting area to study and one that visual observers can contribute greatly to. We should always be alert to the possibility of the aurora appearing when we observe NLC and, if we hit lucky, be ready to record as much detail as possible.
Tom
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Post by markt on Jul 25, 2009 14:41:52 GMT
Interesting elaboration John, thanks for taking the time to explain. I guess with time, more data and more research it is something that may get more clarification in the future.  |
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