Have you seen NLC's?

Im just wondering how far south affects seeing NLC's. I know a small distance can affect seeing an Aurora or not. Just curious if this is the same with NLC's?

NLC's can happen, literally, anywhere Conor. But, like aurora, they are localised. I can't remember what the distances are like, but if one person spots an NLC display in e.g. Cork, chances are the same display will not be seen in Inishowen.

Awrite. Yea i mind the Oct Aurora we were seeing many different beams... from someone else about 30miles away. Mmm i wonder which is higher Auroras of NLC's

Aurorae are higher up, as ts within the magnetic field, but on the edge of the particle atmosphere they are created in.

NLC's depend upon ice and dust in their formation. They are (almost?) the highest forming anything to naturally occur in Earths atmosphere.

Yea true. Whats the highest?

They are sunlit so you'll need to be in the 50-60 degree latitudes or there abouts to see them. Any further south and they'll be below the horizon, much further north and it'll be too bright to see them. (similarly for southern obervers). Like Seanie said, they happen everywhere, but only under certain circumstances can you see them.

iirc they are an artifact in the mesosphere which is around 70km up. so they should be reasonably localised. Someone else can do the maths

I've gotten several texts from an observer in Galway to say there were NLC's visible, but only on one occasion did I see them at the same time. I'd have expected to see them the same time as Galway would since we (Dublin) are at similar latitudes.

Cheers,
~Al

If you look at the post www.irishastronomy.org/boards/viewtopic.php?p=28580#28580 , I think that all the images were taken of the same display on July 7th 2004? I know that Dave's image was taken on the same night from Limerick as my panoamma image further down the page, (maybe Keith and Albert could confirm?)

But from the images it is easy to see the difference that location and time makes. My images were taken at 23:30BST and the displat was all but gone by 0:15BST.

Excellent image!!