Rare halos, Juva

After all, those ellipses finally hit the spot after a few years of waiting. The camera was already on the tripod when I noticed the ellipses in the sky. A quick shot at the camera and stacks of fire. A total of 241 images were collected over a period of 17 minutes. At first, the cover-up was a bit like hurting when you had to recover from a quick situation. As the show luckily continued, I got my cover in a more sensible position. I compiled a few timelaps and a composite image of the images taken from a small radius. Images are cropped in different ways, the original image size is shown in the video in Figure 7. The originals have been aligned and straightened. When watching videos, it is a good idea to cover the mobile cover with your own finger, for example.

Attention is drawn in the figures to the fact that the ellipse is not symmetrical but expands clearly downwards. Also, the radius of the ellipse varies rapidly and at times the ellipse was double. The size variation stands out best in the very last stacks. Pretty mystical.

Figure 1. Stacks of 30 images from 9:27 to 9:37 (3xusm). Pictures of the stacks are taken every 4 seconds.

Figure 2. The previous bg version.

Figure 3. Stacks of 20 images from the early stages from 9:21 to 9:29 (2xusm, 50% resolution).

Figure 4. Timelapse of all valid stacks of 20 images from 9:21 to 9:37 (50% resolution).

Figure 5. Timelapse of 30 image stacks from 9:27 to 9:37. Includes stacks of Figure 1 lighter when stacked.

Figure 6. Every second image from the previous timelapse twice, the variation of the radius of the ellipse is clearly different.

Figure 7. Cloud animation 9: 09-9: 22. A 6-minute snippet is missing from the point where the elliptical halves appeared. Unprocessed images.

This description has been automatically translated from Finnish. Click here to see the original text.

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Tero Sipinen - 11.5.2022 at 17.43

No niin, nyt voi hylätä sen selityksen että epäkeskous olisi alaosan epämääräisyydestä johtuvaa harhaa. Eikä objektiivin projektiokaan noin pienellä matkalla tee noi isoa heittoa.

Seuraava hajatelma onkin, että alaosan isompi säde on joten kytköksissä siihen, että alaosa on heikommin kehittynyt. Eli se tekijä, mikä saa alaosan "hajomaan" kasvattaa myös ellipsin sädettä alapuolella. Mutta siitä tekijästä ei ole minkäänlasta arvausta. Ei edes villiä.

Hieno havainto. Kuten sanottu, ei taida olla kovin montaa pinoa ellipsistä?

Jouni Hovi - 11.5.2022 at 19.53

Hienoa jälkeä.

https://www.taivaanvahti.fi/observations/show/54210

Tuossa yksi pinocase.

Samuli Vuorinen - 12.5.2022 at 12.55

Tero, muistaakseni tuo epäkeskous tulee kyllä simulaatioissakin ihan selkeästi näkyviin. Täytyy myöhemmin tyyppailla HaloRaylla.

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Rare halos - 9.5.2022 at 09.20 - 9.5.2022 at 09.40 Juva Observation number 106680