Wednesday, 21 November 2007
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[...] This year was the first day of Pentecost on the nones of June; and on the Tuesday following were seen four circles at mid-day about the sun, of a white hue, each described under the other as if they were measured. All that saw it wondered; for they never remembered such before. (The Peterborough Chronicle, 1104 A.D.)
5 comments:
Агнес, ты уверена что это пагрелий? я тут практически ничего не вижу. белая линия в центре - просто облако. если сильно вглядываться, то кажется в центре видно часть радужной дуги малого гало, не не пагрелий. Ложное солнце должно быть более ярим и радужным.
пагрелий может быть бело, слишком. Здесь внутренняя сторона рыжевата, и облако будет яркой белизной из-за пагрелий. Трудно заметить пагрелий когда облака очень сделаны по oбразцу (Sorry, I don't know the Russian words here ... so when the clouds are very patterned.)
Это будет уверенно пагрелий. Я последовала за своим развитием и много других людей сообщили после полудня пагрелия сегодня.:)
Посмотри эти:
http://atmosphericoptics.blogspot.com/2007/01/
contrail-sundog-2007-janur-17.html
http://atmosphericoptics.blogspot.com/2007/02/zenti
-krli-v-s-trsai-2007-februr-5.html
посмотрел. действительно это может быть хвостом пагрелия (tail of parhelion), хотя направление его немного странное (strange direction)
Vladimir, I'm writing you in English now because it takes a long time and a lot of dictionary work to compose the answer in Russian.
So sometimes when we see sundogs, they just appear whitish with a bit of red inner edge at the halo. Of course if the sundog is elongated, the edges merge into the parhelic circle (tail of the parhelion) which is definitely bluish-white. But the way we perceive colours is not always as refined as we'd like it to be. So it might happen that what we see as white shows up in colours if you rise the saturation level of your photos. But with naked eyes it looks rather white.
If the clouds are uneven we might only see a whitish patch in the clouds without the spectral colours. This is what I saw this morning, for example. It was so dim that it wasn't even worth taking a photo of it.
http://atoptics.co.uk/halo/dogim2.htm
http://atoptics.co.uk/halo/dogph2d.htm
ok. I understand you.
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