Noctilucent Cloud Watch 2012 Report's, News, Chat, Links
Posted 15 April 2012 - 08:57
Nlc's usually appear from mid May to mid August.They are a very interesting subject to view in the night sky and a great subject for photography.There is a specific range of latitude they are visible from normally 50-65° North and about 82km in height
Noctilucent (Night Shining is a loose Latin Translation)o An indication of the formation of NLC's is when the Mesosphere temperature drops to about -140°C at about 82KM altitude . (Example Dalmellington, Ayrshire August 2011 Capella Being The Bright Star)0 The Bright Star Capella in the constellation Auriga its the third brightest star in the Northern hemisphere and is a good guide for where to look for NLC's0 Heavens Above Star chart Click Here
Types of NLC's Clouds
Type 1: Veil – A simple structureless sheet, sometimes as background to other forms.0 Type 2: Bands – Lines or streaks, parallel or crossing at small angles.0 Type 3: Waves – Fine herring-bone structure like the sand ripples on a beach at low tide. Very characteristic of NLC.0 Type 4: Whirls – Large-scale looped or twisted structures.0 Type 5: Amorphous – Isolated patches of NLC with no definite structure
ISO 200-400, 10-20 secs F2.8
The above settings are a rough guide only and experimentation is recommended
So happy hunting for the 2012 season and look forward to the photographs and reports.
NLC Observers Forum - 2012 - Sightings
http://www.popastro....louds/index.php0 NASA NLC Informationhttps://www.facebook...=wall&filter=12 0 http://www.nasa.gov/mission_pages/aim/0 http://www.thenakeds...interview/2020/0 http://www.antarctica.gov.au/about-antarctica/fact-files/atmosphere/noctilucent-clouds
Posted 15 April 2012 - 09:41
Posted 05 June 2012 - 06:23
Posted 20 June 2012 - 02:45
Posted 20 June 2012 - 10:44
Posted 20 June 2012 - 22:05
Too much cloud down here, but definitely something bright on the Durham Phys dept webcam: http://www.dur.ac.uk...ab/webcam2.html
Posted 22 June 2012 - 07:47
The cloud unexpectedly broke before midnight BST (21 June 2012) although, as you would expect, altocumulus persisted near the northern horizon. I couldn't see anything between 2215Z-2245Z. It was raining during the small hours.
It does seem that so far displays have been weak, unextensive, and low over the horizon thus far, even though there has been widespread cloud cover in the UK so we will have to wait and see.