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Beinns a'Chochuill and Eunaich in mist with brocken spectre

PostPosted: Fri Sep 10, 2010 10:19 pm
by andrew11
I started at 12.30 following the route given on this site. In the end I followed this route exactly. There was intermittent rain and almost constant mist.
As I passed Castles farm I had to walk past a group of Highland Cattle which were mooing continuouly, I think because cows and calves had been separated.
As I got to about 500m the mist got thicker and from there to the top of Beinn a'Chochuill visibility was about 30m. However I saw 2 ptarmagan close up and just managed to catch them with the camera.
As I came down the ridge heading for Beinn Eunaich the mist began to thin and occasional glimpses of the sun came through. As this happened I noticed an amazing optical effect. The sun cast my shadow onto the mist below me and I could see my shadow surrounded by a rainbow. It happened twice but only for a few seconds and I was unable to get my camera out in time to shoot it. I had seen a similar effect from an aircraft a few years ago (see photo). I wonder if anyone else has seen this effect or even has a photo of it.
As I ccontinued to Eunaich the mist closed in again but became patchy as I came down the ridge allowing intermittent atmospheric views and as I drove away Beinn Eunaich stood out in full sun against the background of all the other hills dark with mist.
It was a great day on the hills! I've often said there's no such thing as a bad day on the hills. When I set off it was very unpromising and the farmer at Castles said "you'll see nothing up there the day". But I had a thoroughly enjoyable walk and the easy walking provided by the road from the farm and the paths above made it a daudle! Unfortunately I'd let the camera battery run down and forgotten to bring the spare so can't show any more pictures. I'll double check that tomorrow!!

Re: Beinns a'Chochuill and Eunaich in the mist with rainbow

PostPosted: Tue Sep 21, 2010 7:43 pm
by Oldman
Nice one andrew 11. Your optical phenomenon is called Brocken Spectre. It's caused when the sun above you apparently casts your shadow on cloud or mist below you. I say 'apparently' because the shadow effect is not a real shadow - just looks like one - and the reasons for this phenomenon are not fully understood at this time. The rainbow effect around the shadow is called Glory. Fantastic pic of the aircraft - never seen one like it before. Cheers and good walking.

Re: Beinns a'Chochuill and Eunaich in the mist with rainbow

PostPosted: Tue Sep 21, 2010 11:20 pm
by andrew11
Thanks for the info Oldman.

Googled it and found this image which is very like what I saw. Would be interested to hear if others have seen this phenomenon.
brockenspectre.jpg
similar effect found on google

Re: Beinns a'Chochuill and Eunaich in the mist with rainbow

PostPosted: Wed Sep 22, 2010 12:37 am
by mountain coward
I've seen my Brocken Spectre with a glory quite a few times - I've probably put out posts on here with them on - but they'd be on the 'Outside Scotland' pages... It's a great thing to see though - the first time I did, I danced about on the ridge whooping and shrieking (fairly quietly) - it concerned a guy coming along the ridge sooo much that he re-routed down the back of the mountain and came back up after he'd passed me :lol:

Re: Beinns a'Chochuill and Eunaich in the mist with rainbow

PostPosted: Wed Sep 22, 2010 12:46 am
by mountain coward
Actually, I started a post on the 'General Discussion' page (long time ago) - here is the link:

http://www.walkhighlands.co.uk/Forum/viewtopic.php?f=1&t=630