Naturfoto
Hvorfor oppstår slike underlige lysfenomener om vinteren?
![](https://harvestmag.imgix.net/images/Importert/Annonsering_Stoette/Lysfenomener_solhund-rottungen_640_427_90.jpg?auto=compress%2Cformat&fit=clip&fm=jpg&q=80&sharp=10&w=400&s=1f4e8bad1626273950dd4c63a48b5b29 400w, https://harvestmag.imgix.net/images/Importert/Annonsering_Stoette/Lysfenomener_solhund-rottungen_640_427_90.jpg?auto=compress%2Cformat&fit=clip&fm=jpg&q=80&sharp=10&w=650&s=fbe5fa720cb72e7f029de8545b36c215 650w, https://harvestmag.imgix.net/images/Importert/Annonsering_Stoette/Lysfenomener_solhund-rottungen_640_427_90.jpg?auto=compress%2Cformat&fit=clip&fm=jpg&q=80&sharp=10&w=900&s=f913be0b089d1fae2362565a0d5133b0 900w, https://harvestmag.imgix.net/images/Importert/Annonsering_Stoette/Lysfenomener_solhund-rottungen_640_427_90.jpg?auto=compress%2Cformat&fit=clip&fm=jpg&q=80&sharp=10&w=1150&s=bedbaa13d16f0aad4b6062c576832127 1150w, https://harvestmag.imgix.net/images/Importert/Annonsering_Stoette/Lysfenomener_solhund-rottungen_640_427_90.jpg?auto=compress%2Cformat&fit=clip&fm=jpg&q=80&sharp=10&w=1400&s=4c959dc23ae1f4621dc3aa1f234a8166 1400w, https://harvestmag.imgix.net/images/Importert/Annonsering_Stoette/Lysfenomener_solhund-rottungen_640_427_90.jpg?auto=compress%2Cformat&fit=clip&fm=jpg&q=80&sharp=10&w=1650&s=4d451b30893ef71f59b662e46574c04c 1650w, https://harvestmag.imgix.net/images/Importert/Annonsering_Stoette/Lysfenomener_solhund-rottungen_640_427_90.jpg?auto=compress%2Cformat&fit=clip&fm=jpg&q=80&sharp=10&w=1800&s=61b81794c48bed04a195deb344c61e27 1800w)
- Alle bildene er tatt på ski- skøyte- og gåturer i Oslo og omegn i november, desember og januar måned. Å se disse lysfenomenene er spesielle og vakre naturopplevelser, sier fotograf Svein Nordrum.
På fagspråket kalles de halo. De oppstår ved at lysstråler fra sola eller månen brytes og speiles i iskrystaller i høyereliggende skyer eller i kald tåke.
Halo kan anta en rekke ulike og kompliserte former. Det vanligste er en farget ring med den røde fargen innerst. Denne haloformen er typisk for slørskyer, som ofte er et første varsel om at et nedbørområde nærmer seg. Ved sterk høydevind vil iskrystallene være tilfeldig orientert i rommet, derfor ser man en ring.
I andre situasjoner er høydevinden svak. Haloringen vil da reduseres til en sterkt lysende og farget flekk på hver side av solen. Dette lysfenomenet kalles bisoler.
Kilde: Halo: lysfenomen. (2009, 20. mars). I Store norske leksikon. Hentet 30. januar 2017 fra https://snl.no/halo/lysfenomen.
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