Lunar pollen corona 27./28.5.2013

Observed phenomena: Pollen corona
Light source: Moon
Origin: Pine pollen

Date: 27./28.5.2013
Time: 01:20-01:50
Observing place: Turku, Finland
Observing method: Photography
Technical information about photographing equipment: Camera: Canon EOS 1100D, lens: Canon EF-S 18-55mm

The pollen season has really started now here in Finland! The amount of birch pollen has been relatively low, but there has been plenty of pine pollen in the air! The pine pollen has also been causing some nice coronas around Sun and Moon, like this one that I observed in Turku, Finland between the night of 27th and 28th of May 2013. This lunar pollen corona was very well developed, besides the innermost aureola, there was also one rectangular -shaped ring outside it. Also the brightenings typical for the pine pollen corona were visible in the corona that I observed.

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Atmospheric Optics -meeting was organized in stormy weather

Meeting of the Finnish atmospheric optics -observers was organized in 17.-19.5.2013 at the Tähtikallio Observatory Center in Artjärvi, Southern Finland. The amount of the participants was little bit higher than in the last year’s meeting. This year in total 15 atmospheric optics -enthusiasts participated the meeting.

The meeting started already on Friday, but the programme really started-up on Saturday. On saturday, we heard many interesting lectures. For example, the topics included:

  • Demonstration of the new version of Halo Stack software by Panu Lahtinen
  • Results of the Halo April -observing campaign (Juha Ojanperä)
  • Instructions and hints for observing noctilucent clouds (Veikko Mäkelä)
  • About HDR -teqhnicue in photographing atmospherical phenomena (Juha Ojanperä)
  • The pilot project of reorganizing the section web pages (Veikko Mäkelä)
  • Current issues on Taivaanvahti -online observation database (Marko Pekkola)

Besides this formally organized programme, we got a chance to observe the first really good thunderstorm this summer in the night between Saturday and Sunday! The thunderstorm appeared just like on order to the meeting!

The first thunderstorm of summer 2013

Observed phenomena: Thunderstorm
Observed storm phenomena:

  • Intense lightning
  • Mammatus clouds
  • Shelf cloud ahead of the cumulonimbus
  • Intense rain

Date: 18./19.5.2013
Time: 21:50-01:00
Observing place: Orimattila, Finland
Observing method: Photography
Technical information about photographing equipment: Canon EOS 1100D, objective: Canon EF-S 18-55mm IS

The very first thunderstorm of summer 2013 happened during the Atmospheric Optics -meeting in the night between Saturday and Sunday. In the evening, Marja Wallin noticed, that it’s thundering and alarmed us! We went out to the observing platform to do some stormspotting! The storm started-up slowly, but the it got more intensive and it moved towards us! In this phase we observed also some mammatus clouds in the approaching cumulonimbus. Soon the night got very dark, and lightnings were flashing frequently! Ahead of the approaching cumulonimbus, we observed a shelf cloud. The shelf cloud approached slowly, but eventually it passed us, and the strong wind started to blow! Soon after that, it started raining heavily, and the storm was just above us! Then we observed many lightnings very near us, and some of them hit very close to us! After this, the storm receded, and then the thundering ended and it was just raining.

Pyramide halo display 16.5.2013

Observed phenomena: Halo phenomena
Light source: Sun
Origin: High clouds (cirrostratus)
Observed halo forms:

  • 22° halo
  • Upper tangent arc
  • Lower tangent arc
  • Upper 23° parhelia
  • 18° parhelia

Date: 16.5.2013
Time: 13:35-16:40
Observing place: Turku, Finland
Observing method: Photography
Technical information about photographing equipment: Olympus μ 1030 sw

On 16th of May 2013 I noticed a diffuse -looking upper tangent arc in the sky of Turku. I observed that halo for several hours, and then I thought that perhaps it is not an ordinary upper tangent but an upper 23° parhelia. I’m pretty convinced, that there was also an ordinary upper tangent arc, because I observed also a lower tangent arc in the sky. For a short while, I observed also a weak 22° halo. In the photos, that I took at 16:00, there was also a short arc-like spot in upright position. I interpret, that it could have been a 18° parhelia.

The upper 23° parhelia -interpretation gets support from other observations from Finland on that day. On 16th of May 2013, many observers reported pyramide halo sightings from many localities in southern Finland.