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Post by mesospheric on Jun 14, 2011 8:48:08 GMT
Lovely display last night. NLC were visible to within a tiny fraction of a degree of the horizon, so seeing some 1100km to the north (atmospheric refraction and all the rest ignored!) General view at 01:16UT Attachments:
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Post by tmcewan on Jun 14, 2011 10:33:21 GMT
Worth reminding observers that if there is gap between the NLC and the horizon that it's a good idea to record the height - the 'h' angle, from horizon to base of NLC. Having said that, I've seldom seen this; more often the NLC sinks into low murk or is present right down to the horizon.
Very nice image!
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Post by markt on Jun 14, 2011 10:57:39 GMT
Good stuff John! I suspected seeing this one last night too. The boys in Northern Ireland have some great images of this display...
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Post by mesospheric on Jun 14, 2011 15:06:11 GMT
Similarly, I've seldom seen a 'base' as such. My own measurements are simply of the maximum upper limit during the display period, which seems to be a good indicator of meso temperature. Brightness and complexity of the display are too subjective to be of any real use.
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