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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 .. 22 Next page >>
Track
Corrigasleggaun and Slieve Maan
Peter Walker 2 hours ago.
walk, Len: 17.8km, Climb: 541m, Area: Dublin/Wicklow (Ireland) Corrigasleggaun,...

  
Summit Comment
Binn Bhriocáin: Long views of a stepped descent.
simon3 23 hours ago.
Letterbreckaun can be seen from Clare island, around 33km away. It appears between Mweelrea and the high ground towards the Sheefrys.

  
Summit Comment
Mweelrea: Coastal mountains
simon3 23 hours ago.
Ben Bury and Mweelrea form an impressive sight from Clare Island.

Summit Comment
Caherbarnagh East Top: An unremarkable summit, worth the visit for the views.
David-Guenot 3 days ago.
The summit is unremarkable though easy to spot as it lies along the fence.

  
Track
High tour of Clare Island
simon3 2 days ago.
There are various ways of visiting Clare Island. We opted for a route that took us to the two main summits which also ... walk, Len: 15.0km, Climb: 622m, Area: Knocknaveen, Achill/Corraun (Ireland) K

  
Summit Comment
Caherbarnagh East Top: An easy stroll from Caherbarnagh.
David-Guenot 3 days ago.
There is a gate to cross when coming down from the cairn at the NE end of the main Caherbarnagh ridge (I found it was actually easier to cross the fence just right of the gate). There is a faint t...

Track
Glencullin ridge to Ben Bury/Mweelrea
markwallace 3 days ago.
This route was suggested by the Grade 1 scramble up the Glencullin Ridge described in Alan Tees? Scrambles in Ulster ... walk, Len: 16.5km, Climb: 1097m, Area: Ben Bury, Mweelrea Mountains (Ireland)

  
Summit Comment
Caherbarnagh East Top: A worthwhile addition.
David-Guenot 3 days ago.
This summit is easily reached from the main Caherbarnagh ridge and seems easy enough to get to from Curracahill as well. If coming from Caherbarnagh, best is to cross the fence just before the col...

  
Track
Dart & Sawel
Peter Walker 4 days ago.
(Note: the time is bonkers, and the ascent isn't right either, but hey, at least the distance is correct. And it ende... walk, Len: 16.3km, Climb: 635m, Area: Dart Mountain, Sperrin Mountains (Irelan

Summit Comment
The Paps East: Two shapely hills.
TommyV 6 days ago.
There is a forestry road in the Clydagh Valley with parking at W12955 83343. Following this road will lead you out onto the open mountain. From here it's a steep pull up to spot height 562 metres ...

  
Summit Comment
Caherbarnagh: A mini horseshoe
TommyV 6 days ago.
I mostly followed Aidands directions. There is now a sign on the road marking the path for the Dulhallow Way at beside the bungalow mentioned by Aidand, and several more going through the private ...

  
Track
MV Members Walk - Mournes, 06/04/2019
Peter Walker 5 days ago.
A fun time was had by all as we went up Donard by Thomas' Mountain, dropped down to the Brandy Pad before meandering ... walk, Len: 13.7km, Climb: 1191m, Area: Slieve Donard, Mourne Mountains (Irelan


RECENT CONTRIBUTIONS 1 2 3 .. 22 Next page >>