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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'.
I'm not so sure th.. by simon3   (Show all posts)


RECENT CONTRIBUTIONS 1 2 3 .. 20 Next page >>
Forum: General
A hike in the Alps Maritimes
mallowman 4 hours ago.
I went to the Southern Alps for a trek at the end of October for hopefully some sun and a dose of vitamin D to get me through the winter. Here is a link to my blog of the trip. I hope you enjoy, S...

  
Track
Lake District: Extended Kentmere Round
Onzy 8 hours ago.
Classic Kentmere Round extended to take in High Street. 9 Wainwrights in total. walk, Len: 22.2km, Climb: 1108m, Area: Yoke, Lake District - Eastern Fells (Bri...

  
Track
Lake District: Fairfield Horseshoe
Onzy 8 hours ago.
Lakes Classic round taking in 8 Wainwrights... walk, Len: 19.2km, Climb: 997m, Area: Nab Scar, Lake District - Eastern Fells (...

Forum: General
"Deaded"
BleckCra a week ago.
Never would have thought it but it turns out mountains can can be named after insects. Despite all my decrying this site for its translation of Meelmore as Hill of the Ants, I find right on the do...

  
Track
Croagh Patrick
Paul_Rooney a day ago.
walk, Len: 7.7km, Climb: 709m, Area: Croagh Patrick, Croagh Patrick (Ireland) C...

  
Track
Near Truskmore, Dartry Mountains (Ireland)
Paul_Rooney a day ago.
walk, Len: 8.5km, Climb: 424m, Area: Truskmore, Dartry Mountains (Ireland) Trus...

Summit Comment
Aughinish: Clare Island
sandman a week ago.
This island is located in County Clare but can only be accessed via County Galway. Originally connected to Clare but the connection was lost in 1755 as a result of an earthquake The British built ...

  
Summit Comment
Binn Mhairg: A well worthwhile but neglected scramble
IainT a week ago.
The quartzite slabs on the NE flank of Binn Mhairg make a good scramble, one of the best in the Maum Turks. They are reachable by traversing round from the Mam Ean track, pathless but largely gras...

  
Forum: General
Local 100
wwwalker 3 weeks ago.
I just wanted to say well done on the change to the local 100 conditions. I was nearly there but the last 2 or 3 would have involved almost going through peoples gardens etc. so I abandoned trying...

Summit Comment
Scanlan's Island: Clare Island
sandman a week ago.
Access to the Island is via the gravel road/track located at M2575111537 .During low tide you have no problem driving on to the island and following the track to the left over concrete to within m...

  
Track
Ballyhoura 3 Tops
David-Guenot 2 days ago.
walk, Len: 6.9km, Climb: 363m, Area: Seefin Mountain E Top, Ballyhoura Mountain...

  
Summit Comment
Munnia Top: Coastal Hill
sandman a week ago.
Best to access this hill via the farm gate located on the the coastal side at M2929112163 in order to avoid the houses on the opposite side. Just a quick up and down over grazing land to begin and...


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