Halo vault
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Alec Jones’ e-mail mentioned his website; I was out of my depth but if you are a halo fan this might be for you:
Over the years, I decided to delete some of my blogs and concentrate on my main passion which is atmospheric optics, higher order rainbows and halos in particular. I still have a web presence if you are interested. I run a website with the great Finnish halo researcher Marko Riikonen and halo historian Hungarian Dr. Agnes Kiricsi,
Togel Hongkong, Data Keluaran HK, Data Keluaran SGP, Togel Singapore Hari Ini
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That is very interesting Hygge. Quite rare phenomena are reported on that blog. I am a fan of atoptics by Les Cowley and also very interested in optical phenomena. Unfortunately – for already some time – he is not able to post new OPOD’s and I am reluctant to mail him with questions about arcs I saw. As a matter of fact I saw one yesterday and I try to figure out what I saw. Maybe you can shine a light on this one.
I took the picture(s) between 15:30 and 15:50 when the sun was at about 5 degrees height. In a band of cirrus I saw at roughly the same height as the sun and at a distance of to hand-widths this colorful part of an arc appeared. It fits with what I can find about an infralateral arc. What do you think?
Enhanced picture by adding contrast and extra saturation. The arc was well visible although faint.
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Oops, good reading is difficult. Sorry I missed the double dot making the text that follows not yours Hygge, but from Alec Jones. So my question is wrongly directed. Nevertheless you gave an intersting link with very rare optical phenemona. I am certainly a halo fan, so thank you for giving entrance to this vault filled with halo secrets.
I hope you liked the pictures and when you or anyone else might have an answer to my question I would be delighted.
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I agree, Hans, that colon is very difficult to see – I missed it too on checking, giving me momentary concern I had not put quotes around Alec Jones’ words.
I have e-mailed this topic to Alec Jones. Should he wish to reply to you, either he might post to the topic, or I have offered to cut and paste an e-mail to me.
Fingers crossed.
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Hans, Alec Jones’ reply:
I have had a look at the link you sent and on first glance the arc that Hans posted appears to me to be a segment of a supralateral arc. It’s unusual to get one as colourful as that but not unknown. It could be an infralateral as he suggests but for the fact that the sun appears to be on the right hand side of the image and the arc is “leaning” towards the right. If it was an infralateral it would, generally speaking, be leftwards leaning. It’s difficult to make a precise determination without seeing a wider angle view especially with the sun in the shot and any other halos that were present at the time. Both the supralateral and infralateral change shape depending upon the elevation of the sun. It could be that what you observed was a small fragment of both arcs where they touch and overlap. Please see the simulation in the following link for a better understanding of how they relate to one another at a given solar elevation,
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Thank you very much Hygge for being intermediary and many thanks to Alec Jones for his analysis. I think his assumption comes closest to what I saw. So most probable it was a part of a supralateral arc. Given the simulation found in the link he provided (great instructive site which I did not discover yet, so I am very grateful on that one too!) it fits with what I saw having the sun at 5 degrees height. The arc was a bit higher than sun-level.
Alec asked whether other arcs were visible, but there weren’t in a mixed sky except for a short moment what seemed to be the same at the right side of the sun. It got very quickly covered by a cloud. Unfortunately I was too late to capture this also rather colorful phenomenon at the right side of the sun (at about two hand-width from the sun so also at the right position for the assumed supralateral arc). Furthermore I did just take only one wider view, but on that one nothing relevant is well visible due to some over exposure. I learn from this that it is helpful to make as much pictures of the circumstances to be able to check assumptions afterwards.
Many thanks again to you Hygge and to Alec for his helpful analysis. I am also very happy with the provided link to the site meteoros.de that appears to cover every halo one can possibly encounter including instructive pages on which one can simulate the form en presence of particular halos by changing the height of the sun.
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Hans, I had suggested to Alec he is probably a lifetime member of CAS and indeed he said he was able to log in with his old password (unlike his experience with the old forum). But for the moment he chooses not to restart on the forum; he will be able to read your post should he wish to, of course, so I do not need to e-mail him again.
‘H’
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