Jumat, 13 November 2009

First Solar Halo of the Season

The skies here at our cabin just amaze me. I'm always finding something special. Last week I saw the first solar halo of the season.

A solar halo occurs when when the sky is covered by thin cirrus clouds containing ice crystals high (5–10 km, or 3–6 miles) in the upper troposphere. The sunlight is bent as it passes through the ice crystals. It may also split the light into colors, much like a rainbow. Mine was of the more sedate white variety.

A 22 degree halo is the most common. The light from the sun passing through the ice crystals typically makes the inner edge of the circle more reddish and the outer edge more bluish. I saw this solar halo on May 4, 2008, looking south from my cabin in Hole in the Wall on Powell Lake in Coastal British Columbia. As hard as I tried, it was too large to capture the entire image in my camera's field.

And that's not all. I see some of the same great views reflected back in the clear waters of the lake around me. Here's the flip side of the solar halo, almost as spectacular as the original in the sky. -- Margy

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