Close

Search

Search Menu
Photonics Media Photonics Buyers' Guide Photonics EDU Photonics Spectra BioPhotonics EuroPhotonics Industrial Photonics Photonics Showcase Photonics ProdSpec Photonics Handbook
More News
SPECIAL ANNOUNCEMENT
2016 Photonics Buyers' Guide Clearance! – Use Coupon Code FC16 to save 60%!
share
Email Facebook Twitter Google+ LinkedIn Comments

Halos Indicate Cubic Airborne Ice

Photonics Spectra
Mar 2001
Photographs of atmospheric halos over the Lascar volcano in northern Chile imply that water ice can grow in a cubic crystalline structure. Researchers from the Ursa Astronomical Association of Helsinki, Finland, and Helsinki University of Technology of Espoo, Finland, imaged the rings of light in November 1997. They suggest that temperatures taken at Antofagasta, a town west of the site, indicate that the local conditions were suitable for the growth of cubic ice.

The reflection and refraction of light through atmospheric ice in tropospheric clouds produce the rings and arcs of radii proportional to the crystalline structure of the ice. Reporting in the Nov. 20, 2000, issue of Applied Optics, the team noted that hexagonal ice crystals produced all the other documented halos but that the existence of the naturally occurring cubic form has been proposed for decades.


Comments
Terms & Conditions Privacy Policy About Us Contact Us
back to top

Facebook Twitter Instagram LinkedIn YouTube RSS
©2016 Photonics Media
x Subscribe to Photonics Spectra magazine - FREE!