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Hello Snowflakes!
Ice crystal optics.
Complex fluid can present astonishing effects: ice crystals suspended in atmosphere interacting with light.
oh precious!
another one:
Previous models of snowflakes.
Presenting this subject in Rome, Conference of CHAOS 2018.
Sundogs:
Optics of diffracted rays: https://doi.org/10.1016/j.physleta.2015.10.011
Parhelic circle and 22 degree halo.
PARHELIA REVISITED – MORE ON SUN DOGS IN ROCK ART: https://rockartblog.blogspot.com/2014_05_01_archive.html?fbclid=IwAR0c6Uf4sKOazuSo6-QWU5qicyfuIJrjsBSRPMObgpTD5bWH-JvmfTYEBgo
Drawing of Parhelia from 1630 in Nürnberg.
Halo and artificial light.
Parhelia described by Descartes in Meteora, 1637.
Sun Pillar
Circumzenithal Arc observed this month in Caraguatatuba, Brazil, this month. Feb 4th 2021.
with a polarizer in front of a camera, we show that rainbows are polarized light.
With moon now:
Wow
Measuring the angular aperture of the 22 degree halo.
Ray of sunshine at sea
See you Snowflakes!
I'm sorry, I forgot this important diagram about ice crystals!
and...
Computer simulation of a complex halo display. Four types of crystals are included. Thick plates falling randomly produce the 22° halo. Thin plates falling almost horizontally produce the parhelia, the parhelic circle, and the circumzenithal arc.
And it is important to think about light pillars.
A demonstration of light effects in ice crystals. https://www.mdpi.com/2410-3896/5/3/45/htm#fig_body_display_condensedmatter-05-00045-f004
General view.
Ice, ice, baby.
