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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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Summit Comment
Bealick: Between two counties
Wilderness 11 hours ago.
I approached this mountain from the North East ,coming from the Coomataggart mountains. When I got to the top I had to walk around for a few minutes to pinpoint the true summit; which I'm sure is...

  
Track
Nephin from the North....stunning views.
derkelly274 11 hours ago.
First time climbing Nephin for both myself and my friend. We decided to go at it from the North as it seemed like a more walk, Len: 5.3km, Climb: 644m, Area: Nephin, North Mayo (Ireland) Nephin

  
User profile
derkelly274
derkelly274 14 hours ago.
Enjoy climbing the odd hill. Hope to visit more and more.

Summit Comment
Nephin: A looped climb from the North. Stunning views all around!
derkelly274 11 hours ago.
First time climbing Nephin for both myself and my friend. We decided to go at it from the North as it seemed like a more interesting prospect. There was access to the woods on the northern slope o...

  
Track
Camenabologue SE
Bunsen7 2 days ago.
This shortish alternative track makes use of a forest ride (as heralded by Simon3) from Glenmalure to reach Camenabol... walk, Len: 10.6km, Climb: 664m, Area: Camenabologue SE Top, Dublin/Wicklow (Ir

  
Summit Comment
Knockshanahullion: Route Changes on Avondhu Way
Pepe 17 hours ago.
Approached from carpark above Bay Lough (B). There are new signs on the waymarked trail saying "Blackwater Way Please Note Route Changes". The waymark arrows on the markers look shiny and new, abo...

Track
Mullaghcleevaun circuit
osullivanm 2 days ago.
A very pleasant circuit although some difficult ground between Duff Hill and the return to start of hike. walk, Len: 17.3km, Climb: 792m, Area: Black Hill, Dublin/Wicklow (Ireland) Blac...

  
Summit Comment
Tooreenbaha: Early on a sunny April morning
peter1 23 hours ago.
Tooreenbaha, above the Rabach's Glen at the start (or finish!) of the circuit. Knockatee is the distinctive hill in the background.

  
Forum: General
An Alp for OAPs...
Colin Murphy 4 days ago.
If you an ageing hillwalker like myself who might have liked to bag an ‘Alp’ but are too long in the tooth to contemplate such an adventure, fear not, there is a simple little Austrian Alp you can...

Forum: General
MOUNTAINVIEWS MEMBERS MEET APRIL 2018
liz50 5 days ago.
Not long now until the first Mountainviews members meet of 2018. We will be walking in the Galtee mountains on Saturday 28th April. If you are thinking of joining us and would like more details pl...

  
Summit Comment
Knockowen: A view from the West
peter1 23 hours ago.
A view of Knockowen from Tooreenbaha. The Healy Pass is the gap on the right of the picture and the road can be seen rising across the slopes.

  
Track
Bonscale Pike-Wether Hill Loop
David-Guenot 6 days ago.
A beautiful route which takes in 6 wainwrights (Bonscale Pike, Arthur's Pike, Loadpot Hill, Wether Hill, Steel Knotts... walk, Len: 17.3km, Climb: 948m, Area: Swarth Fell (Ullswater), Lake District -


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