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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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Track
Feet in bog, eyes on planets.
simon3 2 hours ago.
RossnafinnaSince we brought up the number of islands we have to over 570, when looking for a shorter walk I take a lo... walk, Len: 1.7km, Climb: 65m, Area: Rossnafinna Island, Mayo Islands (Ireland)

  
Forum: Suggestions
Outage
simon3 19 hours ago.
Members - MountainViews failed yesterday 23rd June 2018 . The cause was a problem at our hosting company which was resolved in late afternoon.Let us know if the issue returns.

  
User profile
Fergalh
Fergalh 16 hours ago.
Hill walks and Way Marked Trails...

Track
Corraun Circuit
Onzy 18 hours ago.
Route taking in Corraun and its East top. Essentially a variation on Wicklore's track 1404, but without the lift on t... walk, Len: 10.8km, Climb: 604m, Area: Corraun Hill East Top, Achill/Corraun (I

  
Summit Summary
Rossnafinna Island: Small island with huge views.
Collaborative entry Last edit by: simon3 a day ago.
This island can be reached from the north at around F80097 03359 by a small but driveable bridge.There is one central path heading SE from the bridge. There are extensive turf cuttings on both sid...

  
Track
Crossing the Corraun Plateau
simon3 18 hours ago.
There were various other tracks before this one going onto the Corraun plateau but none crossing from one side to the ... walk, Len: 13.7km, Climb: 648m, Area: Corraun Hill, Achill/Corraun (Ireland)

Summit Comment
Knockbwee: Summit Revealed
CaminoPat 2 days ago.
From the south, parking available for only one car at W124 775. Proceed uphill from junction with local road in a NNW direction along a rough stone covered road until you come to a six bar field g...

  
Track
Mournes: Donard and Satellites
Onzy 18 hours ago.
Route to Donard from Bloody Bridge via Crossone taking in Millstone Mountain on the return. walk, Len: 10.6km, Climb: 871m, Area: Crossone, Mourne Mountains (Ireland) Cros...

  
Summit Summary
Crocknafarragh SE Top: Climb it, but include one or more "cousins"
Collaborative entry Last edit by: simon3 3 days ago.
The way to Crocknafarragh SE Top can follow the full route up to Crocknafarragh with an additional 700m walk out to the lesser top or, part of the way up, by contouring up and around the S flanks ...

Track
Croughan ridge by going around Lough Acorrymore
simon3 a day ago.
This is a relatively easy way to reach the Croughan ridgeline and get a taste for the magnificent all-round views. Ir... walk, Len: 7.8km, Climb: 595m, Area: Croaghaun SW Top, Achill/Corraun (Ireland

  
Summit Comment
Baurtregaum Far NE Top: Great views from a so-so mountain
Colin Murphy 4 days ago.
The view over Tralee Bay at low tide from Baurtregaum Far NE Top had the appearance of the Amazon River delta!

  
Summit Comment
Bunnacunneen South Top: Simple bag from nearby tops
Colin Murphy 4 days ago.
For approach see entry for Bunnacunneen SE Top. From that grassy summit it is just over 1km across a gently rising slope to the NW and the South Top's equally grassy summit, which has marvellous p...


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