Effetti (ottici) del freddo.

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In un certo senso il titolo del post vuol dire proprio questo:  che il freddo va venire le traveggole!  Ma no…si tratta di un fenomeno ottico conosciutissimo da tutti i finlandesi:  quando in inverno le temperature sono decisamente basse,  cioe’ nell’ordine dei 20 sottozero,  le particelle di umidita’ presenti nell’aria gelano e talvolta distorcono la visione del sole che sembra avere una specie di punta,  di cuspide.  Il fenomeno qui si chiama: “Halo“,  cioe:  il sole con l’alone.  E’ decisamente suggestivo e ben visibile all’alba e al tramonto:  e’ parte della magia del grande Nord!  Purtroppo e’ imprevedibile,  come molti fenomeni naturali.  Ho scattato queste foto durante una sciata nei boschi vicino a casa,  mentre i gradi erano 14 C sottozero.

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Per non spaventare i miei lettori,  diro’ che le temperature dell’ordine dei 20 sottozero non sono cosi’ comuni qui nella Finlandia meridionale:  certo,  le ondate di freddo intenso possono capitare,  ma non durano mai a lungo.  E poi vi ricordo il proverbio finlandese:  “Non esiste il brutto tempo,  esistono solo i vestiti inadatti”.post20 (1)

Optical effects of cold weather.      The unique phenomenon in my photos is very well known in Finland – they call it:  “Halo“.  It is due to the freezing cold weather;  the tiny molecules of humidity in the air are themselves freezing and sometimes may cause a distorsion in the vision of the sun:  it seems to have a halo,  or aura.  It is particularly appreciable at sunrise or sunset and very impressive:  it is part of the magic of the real North!  Unfortunately it is also unforeseeable.  Photos were taken during a skiing afternoon in the forests around our home,  when temperature was -14 C.

I would like to point out that freezing cold weather in this case means around -20 C,  but in order not to scare my readers I will also clarify that these temperatures are not so common here in south Finland;  a very cold wave is always possible,  but it will not last for all winter!  Anyway,  I remind you a very famous Finnish proverb: “There is never bad weather,  there are only bad clothes!”

 

Linked to:  MakroTex Challenge.  WATW.  SkyWatch Friday.


32 thoughts on “Effetti (ottici) del freddo.

  1. Very beautiful halo effect ❤️ Quasi come un fuoco. Ho sentito dire che in Lapponia si vedono spesso tutti i tipi di effetti della luce. Qui a Helsinki abbiamo qualche volta un tramonto a colori o un bel sorgere del sole ☀️

    Liked by 1 person

  2. Wonderful photos of the halo in the sky. As for the temperatures…that thermometer could well be here in Alberta, where our inside/outside temperatures are very similar. However, it is Spring and we are hoping for warmer weather. The snow is melting, and our little dog is coming to the door covered in mud! 🙂
    Kay
    An Unfittie’s Guide to Adventurous Travel

    Liked by 1 person

  3. Hello, Kay and thanks. I believe the temperatures in Finland are similar to those you have in Alberta. That’s the magic of blogging: you meet people from everywhere and you can discuss with them as if they were so close. Pleased to meet you!

    Like

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