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Post by bloo777 on Jun 26, 2011 21:56:17 GMT
Alright! ;D My first report this year was a false start, but now there is no "maybe"  Weak NLCs today evening seen from Lodz, Poland (no more than hour ago). Strangely NLCs were shifted eastward- most of them were on the azimuth 0-25 (N to NNE) wich is strange because sun was below horizon azimuth 334 (NNW). It looked like they're moving north, so Germany and Denmark should have nice view on them in the morning. Attachments:
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Post by markt on Jun 27, 2011 0:03:19 GMT
Very nice!
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Post by mesospheric on Jun 27, 2011 4:59:34 GMT
This is very common and occurs most years. The azimuth of NLC can be much further east (or west) than the sun's azimuth at the time. Light is reflected/scattered over a much greater angle than a direct sun-NLC-observer line. This is seen in the most extreme case when NLC is, on rare occasions (such as on more than one occasion during 2009) whole-sky, where light is clearly reflected from the side of the sky opposite the sun. I would guess this indicates denser-than-usual NLC, maybe due to greater depth, or possibly NLC ice that is larger than usual. Meanwhile, here is the short (and hurried!) time lapse of this morning, although the sky didn't clear until 02:00UT unfortunately: vimeo.com/25648579 |
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Post by markt on Jun 27, 2011 6:27:20 GMT
Faint John, but definitely there! I was looking till past 1am this morning from sunset alas didn't see anything. I think an automated camera system from my loft window is the way forward for me, from ground level i'm looking up into buildings and also have a pesky streetlight to contend with too...
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Post by mesospheric on Jun 27, 2011 6:40:59 GMT
Faint in the video, for sure. Otherwise, it was pretty bright (b.3) and reached 105 85 degrees in altitude. Attachments:
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Post by tmcewan on Jun 27, 2011 9:28:09 GMT
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Post by Bill W on Jun 27, 2011 10:54:10 GMT
Hi,
Excellent stuff, the season is still building! Whilst the temperature of this part of the atmosphere has to be below a particular threshold it's the humidity that is key. It can be cold enough but if there is no water vapour there will be no nlc (It's how the water gets there that is the interesting thing!?). The humidity generally peaks in mid July and in most years that's when we get to see the best displays. Keep watching the skies as it won't be long....
cheers,
Bill.
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