Double halo? *PICS*...

[Michiel de Boer]

Hi, today (20-7-2003) there was a simple 22º halo display, too bright
to clearly view with the naked eye... So wear cheap sunglasses, those are extra
dark Taken in Limburg, the Netherlands.
Strange was that sometimes it looked like it was a double halo. I presume this
is a 22º halo, and the "tangent arc" was cousing a second one
? I think it's very standard, but you never know. Hope I didn't waste your time

I've modified the contrast (curves) to show them better.
pics with times:
13:12

13:15

13:27 Looks like a soap bubble

13:29 Unmodified photo. Note the halo crossing the sun, also in previous one.
(parhelia?)

13:41 Heavily contrast modified photo of that same parhelia or what it is

[Eva Seidenfaden]

> Hi, today (20-7-2003) there was a simple 22º halo display, too
> bright
> to clearly view with the naked eye... So wear cheap sunglasses,
> those are extra
> dark Taken in Limburg, the Netherlands. Strange was that
> sometimes it looked like it was a double halo. I presume this
> is a 22º halo, and the "tangent arc" was cousing a
> second one
> ? I think it's very standard, but you never know. Hope I didn't
> waste your time
> I've modified the contrast (curves) to show them better.
> pics with times: 13:12 13:15 13:27 Looks like a
> soap bubble 13:29 Unmodified photo. Note the halo
> crossing the sun, also in previous one.
> (parhelia?) 13:41 Heavily contrast modified photo of that
> same parhelia or what it is

Hello Michiel,

you caught a typical high sun circumscribed halo display which has an oval look and can develop very strong colours. The inner part of your display consists of a normal 22° halo. The circumscribed halo without 22° ring is very rare. Please compare with http://www.meteoros.de/arten/ee07e.htm. The circumscribed halo varies much with solar elevation. If solar elevation is less than 32°, you get tangent arcs and no circumscribed halo.

Best wishes

Eva

[Michiel de Boer]

next time I'll surf some more before posting something
I also saw a lovely simulation on http://www.sundog.clara.co.uk/atoptics/phenom.htm