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Ursa Astronomical Association
Kopernikuksentie 1
00130 Helsinki

Ursa Astronomical Association

Corona - 22.1.2019 at 12.54 - 22.1.2019 at 12.58 Oulu Observation number 80686

Visibility Unclassified

This is a bit difficult to classify: color circles were visible around the sun, but the most spectacular part consisted of shadows cast by the power plant’s smoke rods.

Additional information
  • Lightsource of the phenomenon
    • Sunlight
  • How did the phenomenon move?
    • Stayed put
  • How long time did you see the object fly in the sky?
    • Not known
  • 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: 4 pcs
Olli Sälevä - 22.1.2019 at 18.23 Report this

Onpa vain hienot varjot.

Tero Sipinen - 22.1.2019 at 23.49 Report this

On kyllä todella tyylikäs tapaus ja komeat kuvat!

Onkohan tuolla ollut alijäähtynytttä vettä vai pienenpieniä kiteitä ilmassa?

Marko Myllyniemi - 23.1.2019 at 16.57 Report this

No nyt on osunut kohdalle varsinainen varjonheittäjä! Joskus saattaa nähdä lentokoneen jättövanojen heittävän varjoja yläpilvisyyteen, mutta tämä upea näytelmä kyllä pesee ne 100-0!

Pertti Rautiainen - 23.1.2019 at 20.03 Report this

Yleensä tällaisissa tilanteissa joutuu turvautumaan kännykkään, mutta kävi kerrankin tuuri - otin järkkärin mukaan kauppareissulle kuvatakseni pakkasmaisemia. Näkymä eteläisessä taivaanrannassa toi mieleen lähinnä jonkin eksoplaneetan :)

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