algae optical effects (season 2019, Taivaanvahti)

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Timo Kuhmonen
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algae optical effects (season 2019, Taivaanvahti)

Beitrag von Timo Kuhmonen » 20. Mai 2019, 17:54

I collect here observation(s) for algae optics in Taivaanvahti for the summer season 2019.
******************
first one from Jari Luomanen
https://www.taivaanvahti.fi/observations/show/83091

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Elmar Schmidt
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Re: algae optical effects (season 2019, Taivaanvahti)

Beitrag von Elmar Schmidt » 21. Mai 2019, 09:49

Thanks, nice!

The off-center interferences must be Quetelet fringes, do they go by another name in Finnish?

Elmar

Timo Kuhmonen
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Re: algae optical effects (season 2019, Taivaanvahti)

Beitrag von Timo Kuhmonen » 21. Mai 2019, 12:44

In Taivaanvahti obswervation page -> if you press the info button, there is a description in finnish. See blue "i" letter inside a circle. I am not sure how the translation to these optics effects are done, but I understood those were known in foreing literature. I remember first hearing from algae optics, at observations from M. Riikonen...

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Elmar Schmidt
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Re: algae optical effects (season 2019, Taivaanvahti)

Beitrag von Elmar Schmidt » 22. Mai 2019, 08:05

Thanks again, Timo!

I clicked the (?) button and used Bing Translator (actually, not bad for Finnish...). Yes, the large radius rings through the sun's reflection are Quetelet rings. The other phenomena are coronae, and glories on the pond.

Kind regards

Elmar

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Claudia Hinz
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Re: algae optical effects (season 2019, Taivaanvahti)

Beitrag von Claudia Hinz » 22. Mai 2019, 14:21

Nämä ovat ihania valokuvia!
Tervehdys Jarille ja kiitos osoituksesta.

Alexander Haußmann
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Re: algae optical effects (season 2019, Taivaanvahti)

Beitrag von Alexander Haußmann » 22. Mai 2019, 20:07

Nice pictures! Never saw such phenomena myself though. It is remarkable that algae are the only other "partictles" apart from water drops that are known to cause glories.

Best regards,
Alex

Timo Kuhmonen
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Re: algae optical effects (season 2019, Taivaanvahti)

Beitrag von Timo Kuhmonen » 1. Jun 2019, 13:53

fyi. Observation by Satu J. (Lieksa, Finland). According to comments, 70...200 tele lens was used, this might be one point why the images do look like a bit different (to normal wide angle algae photos...)
https://www.taivaanvahti.fi/observations/show/83297

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