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Haloes Forecast Storms - College Essay

Haloes Forecast Storms

NEWSCIENCE
If you know where and when to look, you can treat yourself to a colourful
display of atmospheric haloes, spots and pillars. These images can tell
you something about the clouds overhead and possible changes in the
weather.

All of these images are created by light shining through cirrostratus
clouds. These clouds occur at an altitude of 6,000-12,000 metres. They
appear as a thin sheet or layer (strata) that is pure white. The layer of
cloud is so thin (only 100-450 metres) that is doesn't obscure the sun or
moon, so you should be able to see your shadow.

Cirrostratus is made of many types of ice crystals. However, four crystal
shapes are responsible for producing most of ...

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is
22 degrees. Since the sun is 1/2 of a degree across, the radius of the
halo is 44 sun-widths. Occasionally you may see a second halo at 46
degrees from the sun (that is, with a radius of 92 sun-widths). This is
produced by sunlight passing through both the side and bottom of each
crystal. Moonlight will also produce a halo, around the moon, with the
proper layer of cirrostatus.

Another common optical effect is known as "mock suns" or "sun dogs" or
"parhelia" (Greek for "with the sun"). These bright spots on either side
of the sun, outside of the halo, occur when sunlight passes through the
sides of capped columns, bullets and plate crystals, when these crystals
are arranged with their sides vertical. The crystals wobble, diffusing
and smearing the colours of the mock sun.

You can see haloes and mock suns more clearly if you block out your view
of the real sun by holding your hand in front of it at arm's length.
Another spectactular optical effect is the solar pillar. ...

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Haloes Forecast Storms. (2007, January 17). Retrieved May 1, 2024, from http://www.essayworld.com/essays/Haloes-Forecast-Storms/58827

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PAPER DETAILS

Added: 1/17/2007 01:02:40 AM
Category: Science & Nature
Type: Premium Paper
Words: 520
Pages: 2

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