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Ursa Astronomical Association
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00130 Helsinki

Ursa Astronomical Association

Kehä - 9.2.2017 at 15.26 Muonio, Lommoltunturi Observation number 61048

Visibility Unclassified

Sakari Ekko, Turun Ursa

The perimeter around the Sun, I think, resembles a pollen perimeter, which of course it is not. I only noticed it in the picture because the Sun was so bright you couldn’t look at it - my friend called it soft-edged. The image was taken at a focal length of 34 mm for an MFT cell, so the width of the image area is about 28 degrees. We were just on the upper limit of the ice mist, and the humidity in the air was so high that the bigger camera fogged up so fast I couldn’t shoot with it. The smaller one I got warmed with my hands enough that the outer surface of the lens finally dried. When we left, the temperature was -17 C and in the fell again a dozen degrees higher, so the temperature of the cameras was well below the dew point.

I’ve found that in some situations, the camera’s cell and algorithms, along with the monitor or camera monitor, can cause a perimeter around a bright light source, but that doesn’t seem like it.

Additional information
  • Common atmospheric phenomena
    • Corona info

      Corona (of the sun) is a colored ring or series of rings visible in the immediate vicinity of the light source. It can appear in both clouds and fog.

      Coronae are formed in very small drops of water. The size of the droplets affects the size of the corona ring. The smaller the droplets on average, the larger the circle is.

      With the water droplets being about the same size as each other, a series of strongly colored corona rings can be seen in the sky. When the droplet size is wide, only one ring with faint colors is visible.

      A corona can also be formed by small ice crystals in the upper clouds, but such coronas are very faint.

      The corona phenomena identification in Skywatch is intended for different kinds of corona rings that appear around the Sun. The coronae of the moon and planets have their own phenomena identification selections.

      Unlike halo rings, which are located apart from the Sun or the Moon, the perimeters form a uniform field of light in the immediate vicinity of the celestial body.

      Corona. Image by Ismo Luukkonen.

      Corona in the morning mist. Photo by Iida Pennanen.


      The distortion of the corona is caused by changing droplet sizes in the cloud. Imabe by Eetu Saarti. 

      A solar corona on a thick cloud. The lack of colors and suble changes in shades is hinting about wide range of droplets in different sizes. Photo by Marko Riikonen

      Feeble vaque corona. Image by Matias Takala.


      If the size of the droplets changes drasticly, the corona may appear strongly distorted. Photo by Aki Taavitsainen.

Comments: 8 pcs
Saara Tuohimetsä - 10.2.2017 at 23.30 Report this

Voi vitsi mikä kuva! Maisema näyttää hämmentävän lämpimältä. Ja mitä tyyppejä siinä lumen alla uinuu. Haluan Muohnioon :)

Emma Bruus - 10.2.2017 at 23.43 Report this

Paras kehäkuva minkä olen koskaan nähnyt. Onnittelut!

Mikko Peussa - 11.2.2017 at 00.07 Report this

On kyllä upea kuva!

Oskari Syynimaa - 11.2.2017 at 00.32 Report this

On kyllä hieno! :)

Sakari Ekko - 11.2.2017 at 08.40 Report this

Kiitos kehuista! Kuvan lämmin sävy johtuu siitä, että Aurinko oli jo alhaalla, ja sen valo suodattui lisäksi jääsumun läpi.

Juho Pöllänen - 11.2.2017 at 11.20 Report this

Todella lumoava kuva, tätä katseleisi vaikka kuinka kauan. Laittaisin ehdottomasti johonkin kuvakilpailuun!

Pirjo Koski - 11.2.2017 at 11.47 Report this

Aivan järjettömän upea, komppaan edellisiä :)

Vesa Toropainen - 11.2.2017 at 12.40 Report this

Nyt on kyllä kehäkuva löytänyt uuden ulottuvuuden.

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