20100808 雙層日暈 + 日柱

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Wah!!
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20100808 雙層日暈 + 日柱

文章 Wah!! » 週日 08 8月, 2010 19:35

20100808 雙層日暈 + 日柱
Double Halo + Pillar
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Cindy
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文章 Cindy » 週日 08 8月, 2010 23:14

錦田vs何文田
此田不同彼田
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鄧登凳
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文章 鄧登凳 » 週日 08 8月, 2010 23:19

Cindy家在何文田嗎?

我的家在你的圖內 :)

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KingArthur
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文章 KingArthur » 週日 08 8月, 2010 23:53

I shot the sun pillar a few days ago, and I sent the images to the observatory and here's the reply, made me laugh!
'...The phenomenon is "雲隙光 crepuscular rays". It is quite a common seen during sunset or sunrise time. You can find more details about the cause of this phenomenon by consulting some science books about atmospherics optics or Wikipedia in the internet... '
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Wah!!
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文章 Wah!! » 週一 09 8月, 2010 09:13

DSCF2568m.jpg is "double pillar" ???????? :?

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KingArthur
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文章 KingArthur » 週一 09 8月, 2010 13:47

Wah!! 寫:DSCF2568m.jpg is "double pillar" ???????? :?
Yes, or just double sun ray. :lol:

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Cindy
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文章 Cindy » 週一 09 8月, 2010 14:09

不如去問Les Cowley啦!
http://www.atoptics.co.uk/

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KingArthur
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文章 KingArthur » 週一 09 8月, 2010 15:20

Cindy 寫:不如去問Les Cowley啦!
http://www.atoptics.co.uk/
No need la, when I saw the pillar I already knew what it is, it's just I'm a bit disappointed at the local observatory's response.
From recent days observation it's good to know we still can see sundogs as well the pillars, when high pressure approaches, for interested sky watchers.

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Wah!!
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文章 Wah!! » 週一 09 8月, 2010 15:22

KingArthur 寫:
Cindy 寫:不如去問Les Cowley啦!
http://www.atoptics.co.uk/
No need la, when I saw the pillar I already knew what it is, it's just I'm a bit disappointed at the local observatory's response.
From recent days observation it's good to know we still can see sundogs as well the pillars, when high pressure approaches, for interested sky watchers.
I actually have never heard about "double pillar", I agree with Cindy that Les Cowley may tell us the real answer.

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egret34
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文章 egret34 » 週一 09 8月, 2010 23:44

Wow!! Fantastic capture!!

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simonii
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文章 simonii » 週二 10 8月, 2010 01:45

KingArthur 寫:I shot the sun pillar a few days ago, and I sent the images to the observatory and here's the reply, made me laugh!
'...The phenomenon is "雲隙光 crepuscular rays". It is quite a common seen during sunset or sunrise time. You can find more details about the cause of this phenomenon by consulting some science books about atmospherics optics or Wikipedia in the internet... '

The reply is hilarious. I believe the pictures are showing genuine sun pillars which are pretty different from crepuscular rays. The pillars here present the structure of high altitude ice clusters. I doubt whether this reply is made by SO.

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KingArthur
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文章 KingArthur » 週二 10 8月, 2010 02:41

http://www.atoptics.co.uk/halo/pillar.htm'
...Sometimes they appear as several vertically strung patches of light depending on the locations of the cloud crystals...'
All I'm waiting now is another high pressure ridged sky condition--if any still in this summer, and luck.

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Wah!!
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文章 Wah!! » 週二 10 8月, 2010 07:57

We don't have 2 suns, that's why "double pillar" is so strange for me... :? :? :?

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KingArthur
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文章 KingArthur » 週二 10 8月, 2010 23:20

Have the reply from Dr Cowley today, that's real fast!

"Dear Chuk Man,
I have now had an opportunity to measure your pictures.

You have a very tall sun pillar on all the frames with the possible exception of 2585.

If your camera clock is set to the correct time, I calculate that the sun was below the ground level horizon in all the frames. This is not abnormal because the sun continues to light the higher clouds for some time after ground sunset. I often watch sun pillars moving along the horizon for up to an hour after sunset. Of course, at the latitude of Hong Kong the sun sinks much faster than in the UK.

Could you check the accuracy of your camera clock please?
Frame 2585 probably also has a sun pillar but it could be a crepuscular ray or a combination of both. There are crepuscular rays on 2575 and 2585. I have attached an enhanced view.

The 'second pillar' to the left of the main pillar on 2568-2575 is intriguing. It is 22 degrees from the mail pillar and is most likely a very tall parhelion or a fragment of a 22 degree halo. When the plate crystals present have such large tilts the distinction between these two halos is more academic than real.
I would like to show these images on Optics Picture of the Day? Do you give permission please?
Some links:
http://www.atoptics.co.uk/halo/pillar.htm

http://www.atoptics.co.uk/halo/parhelia.htm
Kind regards,

Les

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simonii
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文章 simonii » 週三 11 8月, 2010 00:07

It is particularly interesting for the 2nd pillar. It really requires some research on whether the 2nd pillar is lighted by parhelia or somewhat related to halo. I hope Dr Cowley will give a more precise explanation on that.

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