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Why is that rainbow white??

fredag 9. august 2019
af Christina Ninou

Since I got here, the day has been getting shorter and shorter, therefore our alarm clocks go off an hour later than usual. Heidi and Martin were up at 4:00 o’ clock, preparing to open the nets, while me and Sander were going to meet them on the first round. Anders was going to observe migration on the hill of Worlds End with Rolf.

On our way to Grenen, just when the sun was rising, Sander and I, witnessed a mysterious misty morning with roe deers running around and slowly getting lost in the foggy scene. While walking on the sand dunes to get to the ringing site it was amazing to feel the huge difference in the temperature when we were higher, were it was warmer than lower were it was chillier on these small sand hills. Nature can be so surprising when moments like these appear and you can feel it around you.

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Our ringing rounds had the same species as every other time, but in a larger variation. A little mix of everything, but this time we had a new species for autumn and this was the Yellowhammer. In the meantime, we got a message from Worlds End that a Red-backed shrike had been seen! Can’t wait to capture them in the nets, even if they are painful! :)

We had the pleasure also to learn something new out there, and if it wasn’t for our beloved moving encyclopedia a.k.a. Martin, we would probably never had observed it. An amazing natural phenomenon: A fogbow! Also known as a white rainbow. The fogbow's lack of colors is caused by the smaller water drops. Diffraction smears out colors that would be created by the larger water drops in a rainbow! As a result, the fog bow has only very weak colors, with a red outer edge and bluish inner edge.

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After returning to the lighthouse, we did the usual indoor activities as well as going to the supermarket to get some stuff for our BBQ. We bought some fresh fish from the port which according to the meat eaters of the gang were very tasty! The evening was windy and cloudy, but we really enjoyed it!

 

Ringing (Sardinkrattet):

Reed warbler – Rørsanger - 1

Lesser whitethroat - Gærdesanger - 4

Blue tit - Blåmejse - 1

Marsh warbler - Kærsanger - 1

Icterine warbler - Gulbug - 1

Common whitethroat - Tornsanger - 8

Yellowhammer - Gulspurv - 1

Garden warbler - Havesanger - 1

Reed bunting - Rørspurv - 1

Chiffchaff - Gransanger - 2

Willow warbler - Løvsanger - 4

Total:    25

 

People: Simon S. Christiansen, Martin Y. Georgiev, Christina Ninou, Anders Odd Wulff Nielsen, Heidi Vibe Frederiksen, Sander HB Villumsen.