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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 .. 15 Next page >>
Summit Comment
Croghan Kinsella: Windfarms completed. Walking trails nearly ready but the trai
mickhanney an hour ago.
Jogged up Croghan Kinsella from entrance at Ballinvalley near Ballycoog where there is space for a couple of cars. The trail upwards is wide and rather industrial in nature. The trail switches bac...

  
Summit Comment
Knockowen: October 2016
davsheen 4 days ago.
View of the impressive Glanrastel valley from the side of Knockowen

  
Summit Comment
Cloghernagh: Picture
davsheen 4 days ago.
Cloghernagh Walk Nov 2016

Summit Summary
Robber's Pass Hill: Minor heathery lump. Overcivilised and underwhelming.
Collaborative entry Last edit by: simon3 a week ago.
This oddly named hill is more a very minor heathery bump incorporated into the system of tracks laid out by the Wicklow Mountains National Park. It can be reached from any of the western car-parks...

  
Summit Comment
Cupidstown Hill: Enhance this with a visit to Oughterard
Bunsen7 4 days ago.
Yes, perhaps this is not a very noteworthy hill. Cupidstown and Saggart Hill represent largely forest topped outliers of the Dublin/Wicklow range split from higher summits to the East by the N81. ...

  
Track
Route to Claggan NE Top
Onzy 6 days ago.
walk, Len: 8.0km, Climb: 2m, Area: Claggan Mountain NE Top, North Mayo (Ireland...

Track
Near South Cork (Ireland)
sean_debarra 4 days ago.
walk, Len: 0.8km, Climb: 15m, Area: South Cork (Ireland)

  
Summit Comment
Farbreague: from Arderin
ewen a week ago.
Walked to Farbreague from Arderin. There is a track that some kind soul has marked with sticks and ribbon. When I say track, it is really a worn down trough in the bog.The multicoloured pipe at th...

  
Track
Slievemore Circuit
Onzy 6 days ago.
Route over Slievemore descending over rough grouns to the SE for variety. walk, Len: 8.1km, Climb: 639m, Area: Slievemore, Achill/Corraun (Ireland) Sliev...

Summit Comment
Tonelagee: Fore!!!
ewen a week ago.
Did from the Wicklow gap car park following track 2378.This starts immediately opposite the top entrance to the car park next to the main road. 5 days before there had been snow but now the path w...

  
Summit Comment
Brandon Hill: Grand on Brandon!
MountainBoy a week ago.
Me and my Dad climbed this from the farm track off the Graiguenamanagh-Instioge road on 26/11/16. Right after we got out of the car, we were faced with the dilemma of whether to go straight ahead ...

  
Track
Knockchree
David-Guenot 2 weeks ago.
An easy one to bag, but a gate/fence to cross at the top and some cows in the field (hopefully no bull), so it may be ... walk, Len: 3.6km, Climb: 127m, Area: Knockchree, Mourne Mountains (Ireland) K


RECENT CONTRIBUTIONS 1 2 3 .. 15 Next page >>