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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 .. 25 Next page >>
Forum: General
Free Bus Service in the Nephew Begs
madfrankie 7 hours ago.
This from The Wild Nephew Beg Mountains Facebook page: The new free bus service is up and running that was set up to ferry people around the Nephin beg wilderness, So far take up on the bus has be...

  
Track
Sheep's Head Ramble...
Onzy 21 hours ago.
walk, Len: 8.4km, Climb: 237m, Area: Cork Islands (Ireland)

  
Summit Comment
Croghan Hill: In the Steps of Old Croghan Man
ladyhawke1003 23 hours ago.
Croghan Hill is one of the main reasons I came to Ireland. I am researching Old Croghan Man for a book. Even with Mel's precise directions we had a little trouble finding the community centre. It ...

Summit Comment
Great Saltee Island: Bird's Glare
simon3 2 days ago.
. .

  
Track
Near Knockshanahullion, Knockmealdown Mountains (Ireland)
jackill a day ago.
walk, Len: 13.6km, Climb: 518m, Area: Knockshanahullion, Knockmealdown Mountain...

  
Summit Comment
Curra Hill: Cloudy Climb
andreos97 5 days ago.
Fantastic walk, personally feel it's best starting your approach from Glenbeigh village and heading up through the forest as it's quite well signposted. Once leaving the cover of the trees, we wer...

Track
Fermoy Scouts night hike
jackill a day ago.
walk, Len: 19.5km, Climb: 928m, Area: Shannon (Ireland)

  
Summit Comment
Cnoc Lios Uachtair: Connemara in the round
fieldoptic a week ago.
An easy to access and navigate hill, well worth it for its central position and views in every direction. Park as previously suggested at L8530 4820 and head north east before swinging north. The ...

  
Track
The Sturrall
Peter Walker 2 days ago.
walk, Len: 9.1km, Climb: 268m, Area: Donegal Islands (Ireland)

Summit Comment
Cnoc Mordáin: Long Connemara Summer Evening
fieldoptic a week ago.
Though the road near L88003920 appears unfenced you will encounter a fence very soon after leaving the road. This fence extends along this back road, Bothar na Scrathóg and keeps cattle in typical...

  
Track
Croaghavehy
Peter Walker 2 days ago.
As prescribed by Mr Sandman. Parked at the Glengesh viewpoint (where I got to admire some quite astonishing car positi... walk, Len: 3.0km, Climb: 114m, Area: Croaghavehy, Donegal SW (Ireland) Croagh

  
Summit Comment
Ballinacorbeg: Worth a brief visit
Bunsen7 a week ago.
Pleasantly surprised by this, could clearly see Lugnaquilla and Croaghanmoira, as well as numerous other summits, slightly awkward entry into the fields just west of the forest which don't appear ...


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