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Ten years ago a ma.. by Bleck Cra   (Show all posts)
eflanaga
2007-11-12 23:06:13
Brocken Spectre
Simon helpfully made me aware of the correct terminology for what I described as a ‘circular rainbow’ photographed when on Croaghbarnes very early one morning (see Croaghbarnes entry last week). I found the following information concerning Brocken Spectres, in case anyone is interested at this website http://www.atoptics.co.uk/droplets/globrock.htm
'As the mountaineer reaches a high ridge, a ghostly figure towers out from the mist, its head sheathed in shimmering rings. This at one time unnerving apparition is the "Spectre of the Brocken", so named because of sightings on the Brocken, the highest peak of Germany's Harz Mountains. The Brocken Spectre appears when a low sun is behind a climber who is looking downwards into mist from a ridge or peak. The "spectre" is the shadowy figure - the glow and rings are of course a glory centered directly opposite the sun at the anti-solar point. But how is the ghostly figure produced? It is no more than the shadow of the climber projected forward through the mist. All shadows converge towards the anti-solar point where the glory also shines. The sometimes odd triangular shape is a perspective effect. The Brocken Spectre is a similar effect to anti-crepuscular rays (rays pointing towards the anti-solar point i.e. at point on the sky sphere directly opposite the sun) and cloud shadows.
The spectre sometimes appears to be huge. This is probably caused by the presence of the glory and the mist obscuring more familiar reference points with which to judge its size'.
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RECENT CONTRIBUTIONS 1 2 3 .. 23 Next page >>
Forum: General
THE POWER OF WORDS
Pepe 7 hours ago.
There I was scratching around on Slieve Binnian. Up top, I bumped into a couple out hillwalking for the day. Pleasantries were exchanged – which way did you come up, fabulous views, the weather – ...

  
Summit Comment
Slieve Binnian: Mind how you go on a route Not Recommended
Pepe 12 hours ago.
Climbed this yesterday on the route leading from Brackenagh Bridge. Chose this route because I wanted to do Moolieve and the Wee Binnian on the way up. On a plus note a local farmer kindly let me ...

  
Summit Comment
An Bhinn Bhuí: A spectacular landscape
Damian120 13 hours ago.
It's a seldom-visited area of County Mayo yet it boasts some of the most impressive coastal architecture in the entire country. After spending five years covering and exploring the landscape of th...

Track
Buckaun - Binnaw circuit.
simon3 13 hours ago.
Hydro scheme at Lough Nadirkmore.The walk starts from a point high in an east facing coum of Maumtrasna. This road goes walk, Len: 5.8km, Climb: 368m, Area: Partry/Joyce Country (Ireland)

  
Track
Croghan Kinsella
jgfitz a day ago.
This is a variation on track #3938, so I will avoid repeating the comments made there, with which I fully agree. This... walk, Len: 11.4km, Climb: 412m, Area: Croghan Kinsella, Dublin/Wicklow (Irelan

  
Track
Knocknalougha South Top
Onzy a day ago.
Route to Knocknalougha South Top from Crow Hill carpark ... as outlined by melohara on the Hill Page... walk, Len: 11.7km, Climb: 430m, Area: Knocknalougha South Top, Knockmealdown Mo...

Track
12 (Listed) Bens - Revisited
GSheehy 3 days ago.
I was drawn back by the lure of completing the 2002 - 12 Bens Challenge route. I got the details from John J. Cotter w... walk, Len: 29.1km, Climb: 2598m, Area: Benglenisky, Twelve Bens (Ireland) Ben

  
Forum: General
Re: Sligo, Leitrim, Roscommon
Peter Walker 2 days ago.
Hi daithi07The 'what's left to do in Ireland' article currently lives largely in my head rather than anywhere more tangible. It will see the light of day at some point in the next few months. I am...

  
Track
Greece, Pelion Peninsula: Paou to Chorto return
Onzy a week ago.
walk, Len: 8.3km, Climb: 237m, Area: Greece, Thessaly ()

Track
Greece, Pelion Peninsula: Affisos to Afetes return (2)
Onzy a week ago.
walk, Len: 9.7km, Climb: 458m, Area: Greece, Thessaly ()

  
Summit Comment
Big Collin: Permission required?
StephenMullin a week ago.
Hi thereCan anybody tell me if permission is required to walk up Big Collin? If so, how does one go about obtaining this?Many thanks!

  
Summit Summary
Anglesey Mountain: Great Carlingford views from a so-so top
Collaborative entry Last edit by: Colin Murphy a week ago.
There is enough space to park one car at 100 167, just on the edge of a wood around a sharp u-bend. Proceed north for 100m before turning NE up a gentle slope, although the terrain is treacherous ...


RECENT CONTRIBUTIONS 1 2 3 .. 23 Next page >>