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Haloes Forecast Storms
Part 1 of Paper
....mospheric 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.... Part 2 of Paper
..... 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 thr.... |
| Number of words: 520 - Approximate pages: 2 |
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