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Skywarden,
Ursa Astronomical Association
Kopernikuksentie 1
00130 Helsinki
taivaanvahti(at)ursa.fi

Ursa Astronomical Association

Pearl clouds - 31.12.2019 at 11.30 - 31.12.2019 at 15.15 Enontekiö Observation number 87160

Visibility V / V


I went driving south from Kilpisjärvi to look for the clear sky and the colors of camouflage. I would never have thought I could see pearl clouds and still see such intense colors. I shot for over 3 hours in all sorts of shapes, close to and with the landscape. In the beginning the colors were subtle and as the sun went down more, there became really intense colors, especially orange and purple. A memorable experience of what makes the heart continue to round.



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Additional information
  • Havainto
    • Pearl clouds
  • Cloud coverage in the sky
    • Covered 3/8 of the sky
  • Nacreous clouds
    • Pearl clouds of type II (ice) info

      Pearl clouds (Nacreous clouds) are clouds that occur in winter and are best seen at dusk in the morning and evening when the Sun is below the horizon.

      Although the name of pearl clouds refers to spectral colors, colored (type II) pearls are rare in Finland. We mainly see colorless, pale (type I) pearls. A striking feature related to pearl clouds in Finland is also the strong brown, which makes the landscape bathe in intense red or purple light.

      The Sky Watch has categories for type I and II nacreous clouds, as well as the brown subtype. This selection reports pearl clouds representing type II spectral colors.

      While ordinary clouds are located in the lowest layer of the atmosphere in the troposphere, nacreous clouds form in the stratosphere above this at a height of 15 to 25 km above the ground. They occur when the stratosphere is exceptionally cold, about -75 ...- 85 C.

      The particles that cause pearl clouds are either pure water ice (type II) or chemically different crystals, all of which contain nitric acid (type I) as an ingredient.

      Changes in stratospheric thermal conditions are quite sluggish, which is why pearl clouds are seen continuously for at least a few days unless the lower clouds obscure the view. Nacreous clouds can be extensive in their occurrence and can occur simultaneously throughout Finland. However, the focus of the performances is in Lapland.

      The appearance of nacreous clouds in the sky can be predicted by stratospheric temperature predictions. Pearl cloud observations made in Finland from 1996 to 2014 show that they had been seen from December to March. Most occurred in December-January, in March pearl clouds were reported in only one year.

      The particles responsible for the pearl clouds can also give rise to the Bishop ring. The Bishop’s ring may be a clear sign of nacreous clouds when the Sun is on the horizon. The pearl clouds themselves usually stand out when the Sun is on the horizon, but in this case they are usually very ghostly cloud fibers and easily go unnoticed.

      In the winter of 2012-2013, Finland experienced an exceptionally long 13-day pearl cloud streak. On the second to last day of the episode, rare spectral colors also appeared in the clouds. Photo by Matti Helin.

Comments: 12 pcs
Mauri Korpi - 3.1.2020 at 08.28 Report this

On todella järkyttävän komeaa!

Antero Ohranen - 3.1.2020 at 08.50 Report this

Voe mahoto...kyllä nyt on hienoa jälkeä!!!

Eero Karvinen - 3.1.2020 at 12.54 Report this

Ykköskuvassa päästiin jo itse asiaan! On hieno!

Vesa Toropainen - 3.1.2020 at 13.15 Report this

Ykköskuva on kyllä niin mahtava että vaikea uskoa todeksi (uskon kuitenkin).

Antti Taskinen - 3.1.2020 at 16.19 Report this

Uskomaton näky!

Marko Pekkola - 3.1.2020 at 17.17 Report this

Aivan fantastinen tuo pääkuva. 

Olli Sälevä - 3.1.2020 at 18.48 Report this

On ollut hieno tilanne, kun pääsee seuraamaan tuollaista näytöstä.

Jani Päiväniemi - 3.1.2020 at 20.15 Report this

Mahtavaa! Onnittelut hienosta havainnosta!

Mikko Peussa - 3.1.2020 at 20.47 Report this

Komea on ollut taivas!

Merja Koivuranta - 3.1.2020 at 21.02 Report this

Aivan upea kuva taivaan mahtavasta ilmiöstä, kiitos! Hienoa, että pohjoisen kuvat ilahduttavat täällä etelämpänä, kun meillä paljon vähemmän ihailtavaa.

Heidi Rikala - 3.1.2020 at 22.44 Report this

Hyvät ihmiset!!! käsittämättömän fantastinen tuo ykköskuva! Onnittelut upeasta havainnosta!

Raija Ollikainen - 3.1.2020 at 23.37 Report this

Ihan älytöntä! - Krass, wahnsinn, Thomas!!!

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