Visibility IV / V
We saw an equally well-developed light phenomenon on the surface of algae about 20 years ago. Weaker is seen 1-2 times in the summer. Typically, this phenomenon was also seen on an island in the sea, not in a puddle right on the water's edge in the middle of a warm season and on a calm day.
Around the sun was a colorful needle-like pattern, with bright horizontal arcs. Around the observer's head we saw multiple gloria and a pale "fog arc." The phenomena were interconnected by light, barely distinct transverse arcs (the so-called "crown?").
The water in the puddle was quite clear, only the surface had an extremely thin algal membrane that appeared to consist of small oily particles. In the picture, a sample of algae has been picked from the haystack.
Photographer: Jouko Markkanen. The images have not been processed in any way. Observation team: Krista Vajanto, Jouko, Aarni, Urho and Pyry Markkkanen