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Conditions, padode.. by dhmiriam   (Show all posts)
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 .. 23 Next page >>
Forum: General
MOUNTAINVIEWS MEMBERS MEET SEPTEMBER 2018
liz50 12 hours ago.
Traverse of Brandon Ridge is scheduled for Saturday 8th September. The walk from the Connor Pass to Brandon Creek is around 18km with 1300m ascent taking around 7 hours. There is a slightly shorte...

  
Track
Burrane Upper
conormcbandon a day ago.
walk, Len: 0.8km, Climb: 43m, Area: Burrane Upper, Clare Coastal Hill (Ireland)...

  
Summit Comment
Knockakishaun: Bunowen River can present problems
markwallace a day ago.
Parked at a layby further up the valley from the crossing point mentioned in James Sheerin's comment to do a circuit of Laghta Eighter and Knockakishaun. Access to Laghta Eighter was easy from hig...

Forum: General
2 baaags please
BleckCra a day ago.
Yes Aidy. Apparently there's some bad grass going around.

  
Track
Kilmore
conormcbandon a day ago.
walk, Len: 1.0km, Climb: 26m, Area: Kilmore, Clare Coastal Hill (Ireland) Kilmo...

  
Summit Comment
Crocknafarragh: The High Route around Glentornan Lough
jsramsey1491 2 days ago.
Last Thursday (16/08/2018) a few friends and I decided to do a recce of a walk around Glentornan Lough. We started close to the Gaelic pitch on the southwestern shore of Lough Nacung Upper, passed...

Track
Oileán an Bhromaigh
conormcbandon a day ago.
walk, Len: 1.1km, Climb: 21m, Area: Oile?n an Bhromaigh, Galway Islands (Irelan...

  
Summit Comment
An Bhinn Bhuí: Benwee Head Loop.
sandman 3 days ago.
As already stated Benwee Head has some of the most dramatic costal scenery in Ireland and with this in mind i decided to enjoy on a clear sunny day the joys of walking the 12.4km of the Benwee Hea...

  
Track
Cnoc Mordain
conormcbandon a day ago.
walk, Len: 10.0km, Climb: 457m, Area: Cnoc Mord?in, South Connemara (Ireland) C...

Summit Comment
Knocknanacree: Storm Beach and Cliffs at lower western reaches
Bunsen7 3 days ago.
A view of "Acres" from Minard Beach. This is apparently a geologically interesting spot in itself as it is a storm beach comprised of large sandstone boulders. The castle is on private land and no...

  
Summit Comment
Knockafeehane: From the horse's mouth
Bunsen7 3 days ago.
This is the trail description post at Q59652 00497. It summarises the route if taken from east to west, as per track 3881.Vastly superior to my own garbled efforts!Annascaul obviously is a very we...

  
Track
Barraderry
conormcbandon a day ago.
walk, Len: 1.2km, Climb: 40m, Area: Barraderry, Galway Coastal Hill (Ireland) B...


RECENT CONTRIBUTIONS 1 2 3 .. 23 Next page >>