Hello everyone,
after several talks with Alec, I decided to make some digging into my old odd radius halos displays to search for rare halos and find out some more 28d halo (and 13d halos too).
Here are some examples of what I found so far that might be interesting to submit here to your assessment. I hope you will find those cases interesting.
For some of them, I still have all the raw files of the sequence, for others, I kept few raw images, but for all of them (exposed here at least) I made various time-lapses to keep sequence in B-R rendering, colour rendering, stacked with 4 or 8 images each, like the one I presented earlier in this blog.
I will start with a sharp display of odd radius circular halos I got last year, in April, at the morning.
I'm not usually an early bird so I can miss some nice displays each year. For this one I got the chance to have the display still available to start a capture from my roof window. The center of my house is a stair tower which offer a nice blocking roof for the spot I am from. Therefore, with the shaprness of the display, the 9° ring was particularly well visible on B-R rendering before the sun comes out of the roof (because the diffusion of the light on the lens add noise up to the 9° ring area).
There is a first image, B-R rendered from a sole raw image, to give a view of the sharpness of the event:
Stacking with the above one as first image, with the 25 following images makes those odd radius halos more clear:
Well, in the light of recent search for 28+° ring, this was one of my first tries even if I was expecting, like for the 13° halo, to find it when the rings are not sharp. But if you don't try, you won't find anything.
So there is a processing the the previous stack to enhance sharp halo first then eventually larger borders ones if any.
There is a folder on my drive, so you can take a look at the time-lapses of the day. As usual, better download it rather than viewing it as a Youtube video, to have a better video compression (as is the original one)
Many years ago, I got a nice odd radius display at sunset, during a day of November 2014. The view is not ideal, as I placed my camera on the edge of a window, look south, with a wide angle rectangular lens, hence the distortion. (EoS 1200D + Sigma 8-16mm, set at 8mm).
I was so amazed by the display I sent it to Nicolas Lefaudeux to have his expertise on the matter. And then he told me I caught the 28° halo, again (but I don't recall why this 'again') ;-)
There is the display, B-R rendered, and unsharp masked.
Unfortunatly, I did not keep any raw file of this event.
There is a folder where are all the remainings.
And any old how, here are some I cannot say it is, but looks like there might be something there.... or not:
And while browsing at all of those, I realized I got at least a dozen of 13° halos, with at least one with the Moon. Which could make a post after this one, for the record.
And a last one, not for the 28d spotting, but only because I like it a lot:
Now, a couple hours after starting this post, I think I may go get some rest ;-).
Greetings from France.
Nicolas R.
Showing posts with label 9° halo. Show all posts
Showing posts with label 9° halo. Show all posts
Thursday, 18 May 2023
Friday, 24 March 2023
Odd Radius Display Including 13° Halo, Vilnius, Lithuania 18th March 2023
The display occurred on 18 of March and I observed it from Vilnius, Lithuania.
For the whole day, cirrostratus clouds covered the entire sky. The clouds were moving eastward and also sublimating.
I started observing at 10:25 EET. At that time there were already odd radius halos present: with the naked eye, you could definitely notice both the 9° and 18° halos.
At 11:45, only the 9° halo was present, and at 12:00 the odd radius halos disappeared. After that, and until around 17:00, there were a faint 22° halo and tangent arc visible.
I photographed the halos in raw format with a DSLR camera. After enhancing the images, a 35° halo became visible, but I was surprised the most to see a ring between 9° and 18° halos, which appeared to be a 13° halo. After sending the images to The Halo Vault, I got a confirmation about this from Nicolas Lefaudeux and the Halo Vault team.
Here are some pictures from the display, last two of them in the sequence were processed by Nicolas Lefaudeux:
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| (All images copyright Donatas Gražulis) |
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| (Image processed by Nicolas Lefaudeux) |
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| (Image processed by Nicolas Lefaudeux) |
A similar feature appears in an older photograph that I took on 25 of June 2019. This is the only photo from that day that this appears in; it was taken with a phone:
- Donatas Gražulis
Sunday, 18 August 2019
Odd Radius Display, Southern Ohio, USA, 17th August 2019
On the evening of Saturday, 17th August 2019, I observed this complex pyramidal halo display. In total, I saw a faint 9d halo, lower 9d plate arc, bright 18d plate arc, 18d halo, upper and lower 24d plate arcs and a weak upper 23d plate arc. This display is very similar to the one I captured in 2017, the only difference being the one in 2017 the lower 9d plate arc was bright and colorful and in the present display it was weak.
Saturday, 14 April 2018
Odd Radius Display, Bolton, United Kingdom
On the 5th April 2018, there was a short lived but rather nice odd radius display in Bolton, a town situated in the north west of the United Kingdom. As I was preparing to go to work, I noticed the top of what I initially took to be a 22d halo. However, it rapidly developed and became more complex and very soon an 18d became easily visible to the eye. The display lasted about thirty minutes in total and I was only able to take a few single shots and a couple of stacks before it began to fade and I had to leave. Upon processing the images, 9, 18, 23, 24 and 35d halos with attendant plate arcs were identified as being present.
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| Processing courtesy Nicolas Lefaudeux. |
Thursday, 5 April 2018
Pyramidal Crystals Attacked Hungary
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| Photo by: Károly Tuszinger - Budapest, Hungary (single frame) |
Despite the government’s efforts to stop “invaders” at the border, a lot
of pyramidal ice crystals could penetrate our homeland on the 3rd of April. At
least 3 legions of them rushed across the country arriving from West and
reaching the Eastern borders late in the afternoon. The attack had left a lot
of people with severely high adrenaline levels – and a lot of excellent
photographs!
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| Photo by: László Dombai - Vép, Hungary (single frame) |
The first signs of the display appeared at early dawn when a vivid
circumscribed lunar halo formed with some moondogs, faint CZA and easily visible,
still faint supralateral arc. In some pics an extremely faint 9d halo was
noticed later (I could not see it while being outside). Then after sunrise in
the early morning, parts of 18d arcs were visible, probably they were 18d
parhelia, but this only lasted a very few minutes and they were also faint. For
some hours nothing happened, then at noon another pyramidal crystal containing
cirrus arrived and caused a fine display at my place which lasted for about 20
minutes. 9-18d halos were well visible and also the „22d” halo’s arc was too
broad to be a simple 22d halo. I took some pics around, but 35d was not
present. In the meanwhile the clouds drifted towards East, they were on their
way to Budapest and the surrounding area where a lot of people could observe
and capture the best of the show in the afternoon. This region had received the
elite commando of the pyramidal legions, with an extremely vivid display; the
arcs were easily seen even on the worst quality weather webcams’ images! Webcam videos of idokep.hu: Fót and Hajdúszoboszló, Hungary.
A
decent full circle 9d halo with colourful 9d parhelia appeared on most pics,
the full circle 18d halo with vivid 18d parhelia was also present, 23d full
circles with some cases of 23d upper parhelion (or at least the arc’s colour
was much more vivid at the location of the 23d upper parhelion). One wide angle
pic shows signs of a very faint 35d arc too. The show lasted about an hour (at
least the N parts of the capital). Then the clouds drifted on towards the East
and caused a less spectacular but still fine display late afternoon. The
northern half of the country was affected by the display or at least parts of
it during the day.
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| 35d halo on the single frame image of Péter Lenkei from Ötschergraben, Austria |
Of course this is the case when stacking would lure out more
detail, but most people just rushed out from their workplaces to capture the
rarity with their cellphone cameras, still the beauty of the show was that even
without stacking many details were visible.
I guess it was very lucky that the
clouds had done their best in the Budapest area where most of the population
concentrates, so many observers could capture the show. I can’t remember any similar
case of pyramidal display in Hungary in the past 20 years, it was so vivid, so
widespread and so complex!
By: Mónika Landy-Gyebnár
Monday, 5 March 2018
Odd radius plate display from the Czech Republic
On 4th March Jitka R. from the Czech republic captured this magnificent odd radius display on the Moon. After stacking multiple images, many halo forms showed up - particulary 9°, 18°, 20°, 24° and 35° halos, along with 9° and 24° plate arcs.
It was a case of sublimating cirrus, which could be easily seen on the satellite images.
And I have a question for the halo experts - is it possible that the 9° column arcs are captured, too? Or could it just be a cirrus of a higher quality?
Monday, 30 October 2017
Display of 4th June 2017 in Pskov oblast
It was a weak odd-radius display which contained not only familiar pyramidal halos with radii of 9, 20, 24 and 35 degrees, but also a mysterious 13° halo! You can notice this diffuse 13° ring between 9° and 20° halos on the image above. You can also notice that the 20° halo is brighter than the 22°. The 35° halo is clearly visible on the image below.
With the naked eye only parhelia were visible during the display. The display was short and lasted about an hour and a half.
Saturday, 17 June 2017
Reign of the Pyramids
Well seems like most of the rare halos I have been getting are pyramidal this year and I like pyramidal stuff. This morning I got up and later on 18 and 23d halos formed along with a nice upper 23d plate arc and 18d plate arcs. Later on faint 9d halo and when looking at the convex mirror faint 35d halo and it shows up in Photoshop.
Monday, 29 May 2017
Large scale odd radius halo complex on Memorial Holiday 5-29-17
About an hour before midday a layer of cirrus stratus clouds began moving toward the sun and I looked up and saw a colorful 22d halo and I noticed it looked doubled all the way around and looking close to the sun I saw weak 9d halo. I grabbed my camera and then it got spectacular. The 24d halo not only was bright it was sharp and complete and was my best yet to date. While taking picture after picture I saw a segment of a larger halo appear and it turned out the be 35d halo. As the clouds moved thru it peaked with a total of 5 rings the 9,20,22,24, and 35d halos and the 35d halo I got today was my best to date. This could be my best pyramidal display to date but who knows I could get better some day.
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