20100808 雙層日暈 + 日柱
20100808 雙層日暈 + 日柱
20100808 雙層日暈 + 日柱
Double Halo + Pillar
Double Halo + Pillar
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- DoubleHalo1.jpg (171.43 KiB) 已瀏覽 10026 次
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- DoubleHalo2.jpg (227.81 KiB) 已瀏覽 9971 次
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- Pillar1.jpg (73.31 KiB) 已瀏覽 9969 次
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- IMG_0167s.jpg (62.67 KiB) 已瀏覽 9968 次
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- IMG_0172s.jpg (74.41 KiB) 已瀏覽 9968 次
- KingArthur
- 夸克星
- 文章: 2398
- 註冊時間: 週四 14 8月, 2003 17:50
- 來自: Lantau
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 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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- DSCF2575m.jpg (76.17 KiB) 已瀏覽 9915 次
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- DSCF2568m.jpg (115.4 KiB) 已瀏覽 9915 次
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- DSCF2531m.jpg (66.21 KiB) 已瀏覽 9915 次
- KingArthur
- 夸克星
- 文章: 2398
- 註冊時間: 週四 14 8月, 2003 17:50
- 來自: Lantau
- KingArthur
- 夸克星
- 文章: 2398
- 註冊時間: 週四 14 8月, 2003 17:50
- 來自: Lantau
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.Cindy 寫:不如去問Les Cowley啦!
http://www.atoptics.co.uk/
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.KingArthur 寫: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.Cindy 寫:不如去問Les Cowley啦!
http://www.atoptics.co.uk/
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.
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.
- KingArthur
- 夸克星
- 文章: 2398
- 註冊時間: 週四 14 8月, 2003 17:50
- 來自: Lantau
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.
...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.
- KingArthur
- 夸克星
- 文章: 2398
- 註冊時間: 週四 14 8月, 2003 17:50
- 來自: Lantau
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
"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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