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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 .. 17 Next page >>
Summit Comment
Truskmore: ACCESS PROBLEM at CLOONTYPRUGHLISH IG788 476
eflanaga 3 hours ago.
Earlier today I accompanied a friend, who is completing the County Tops, to climb onto Truskmore. Having previously summited from the Glencar and Tievebaun sides I suggested we go up by Eagles Roc...

  
Forum: General
Irish hill runners and the Spine Race
IainT 6 hours ago.
The Spine Race is a 268 mile run up the Pennine Way in the north of England, run every January, invariably featuring snowdrifts, gales and many miles of sucking bog, much of it run in the dark. It...

  
Track
Cadair Idris Circuit
Onzy 7 hours ago.
Route over Cadair Idris with a number of extensions. This descent is far from intuitive, largely untracked and involv... walk, Len: 14.7km, Climb: 1086m, Area: Craig Lwyd, Dolgellau to Machynlleth (B

Summit Comment
Slieve Binnian: New developments
Mrswoodlands 20 hours ago.
Climbed Binnion from the Carrick Little car park yesterday. We went up the Mourne wall as described by other contributers. While hugging the wall, as described, we noted a clear track not previous...

  
Summit Summary
Seefin Mountain E Top: Up the old bog road.
Collaborative entry Last edit by: melohara 4 days ago.
Car park space at R66276 16811. Over or around the gate and head uphill on a good track that crosses the hill near the summit.On the crest of the hill the summit cairn is over a wall to your right...

  
Track
Snowdon: Nantlle Ridge
Onzy 7 hours ago.
Nantlle Ridge route. Few blips in track - distance is about 20k, ascent 1,250 and time 7.30. walk, Len: 15.6km, Climb: 837m, Area: Y Garn, Snowdonia (Britain) Y Garn, Mynyd...

Summit Summary
Seefin Mountain W Top: Bog and rough ground.
Collaborative entry Last edit by: melohara 4 days ago.
Car park space at R66276 16811. Over or around the gate and head uphill on a good track that crosses the hill near the summit of Seefin Mountain East top.Follow the track on downhill from the cres...

  
Summit Summary
Seefin South-East Top: Seefin South East Top is easily visited
Collaborative entry Last edit by: melohara 4 days ago.
Seefin South East Top is easily visited from the track leading to Seefin Mountain East Top and Seefin Mountain West Top which starts st R66276 16811. Just follow the track to R65202 17892 from whe...

  
Track
Central Dingle Quartet from Anascaul
Bunsen7 2 days ago.
Follow the track from Anascaul lake car park northwards up onto the mountain plateau.Track leads northwards from lake... walk, Len: 15.8km, Climb: 949m, Area: Stradbally Mountain, Central Dingle (Ire

Summit Comment
Carnaween: The visitors book box near the summit
Aidy a week ago.
Just wanted to show the brilliantly constructed little box which contains the visitors book. It was too wet and windy on my visit to take it out and risk ruining it. A few shafts of light breaking...

  
Summit Comment
Carnaween: Bad Weather Adding Drama To Great Views
Aidy a week ago.
I used the commonly taken route from Disert Graveyard (worth a visit in its own right) over ground that was alternatively boggy or pretty steep. It was freezing cold in these parts, with a strong ...

  
Summit Comment
Corrin: A family stroll.
David-Guenot a week ago.
Climbed this hill in November 2014, with a friend who used to live in the area. Starting at the Coillte car park, we did a nice loop on the forest paths, circling around the hill in an anticlockwi...


RECENT CONTRIBUTIONS 1 2 3 .. 17 Next page >>