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Ursa Astronomical Association

Väripilviä - 14.5.2017 at 16.34 - 14.5.2017 at 16.45 Helsinki, Viikinranta-Viikki Observation number 63956

Visibility V / V

Veikko Mäkelä, Ursa (Helsinki)

I was on my way from home to Espoo, when I was already noticing from the front door that there is a nice looking altoculumus lenticuralis. At the bus stop, I already noticed clouds of color near the Sun, but they reached at least 15 degrees.

At the exchange stop in Viikki, the play became quite spectacular. First, there were circumferential color zones in the more tattered AC cloud above the Sun, albeit slightly scattered longitudinally. Then, on the left side, a dense Ac board showed intense colors that formed zones typical of color clouds, and an "eye" formed in the center.

Although the colors in the images are slightly enhanced by exposure and reading with USM, they were really easily visible to the naked eye without the sunglasses.

colors: P, vP, S, T, V, K, Vi
maximum distance from the Sun: <15 °
birth: Ac

Additional information
  • Lightsource of the phenomenon
    • Sunlight
  • Common atmospheric phenomena
    • Iridescent clouds info

      Iridescent clouds are clouds colored in the colors of spectra in the vicinity of a light source. The phenomenon is very common.

      Like a corona, a clouds of color are formed when light is scattered in small water droplets. Fineest colors are seen in cirrocumulus and altocumulus lenticularis-type clouds. The more mundane-looking color clouds, on the other hand, are lower clouds.

      Like coronae, color clouds usually occur only very close to the Sun. Their colors are more clearly visible through sunglasses.

      The word "iridescent clouds", clouds with colors, may sound the same as any colored cloud that exists. However clouds colored reddish by morning or evening dusk are not the same thing. The ridescent clouds specifically show the full color of spectrum. The iridescent clouds are not a synonym for the also colorful mother-of-pearl -clouds. These polar stratospheric clouds are a different phenomenon that occurs and very low winter temperatures hight in the atmosphere.

      Cloud iridescence on altocumulus lentocularis. Photo by Panu Lahtinen.


      Colors of spectrum on an altocumulus cloud. Image by Matti Helin.

      Iridescent Stratocumulus cloud. Photo by Panu Lahtinen.


      Sometimes it may be difficult to determine, if the colors on the cloud belong to a corona or cloud irridescence. This one could be marked with either one or both of the phenomena identifications. Image by Marko Myllyniemi.

Technical information

Photos at 4:42 p.m .; 16.34, 16.35, 16.40, 16.43 and 16.44
Samsung Galaxy S5 (SM-G900F), 4.8 mm + digizoom [1,2,4,6,7]; f / 2.2; 1/16064 s, 1/13472 s, 1/8480 s, 1/15680 s, 1/6512 s, 1/4656 s, and 1/10848 s; ISO 40
partial blurred mask

Comments: 1 pcs
Mikko Peussa - 15.5.2017 at 23.59 Report this

Näyttävät väripilvet! Hienoja kun ovat vähän kauempana auringosta ja yläpilvissä.

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