-Caveat Lector-
Audio Eclipse August 11th May Fill The Sky...08/05/99
(NASA) During a total solar eclipse, day becomes night for a few
precious minutes. The temperature drops,
birds stop
singing, and bees return to their hives for a premature rest. An eerie
quiet envelopes the landscape inside
the path of totality.
However, from the unique perspective of a ham radio operator, night is
anything but quiet - and neither is a
solar eclipse.
Many shortwave radio stations that are undetectable in daytime are easy
to pick up at night. The reason has
to do with the
Sun's effect on Earth's atmosphere. During the day, solar UV radiation
ionizes atoms and molecules in the
upper atmosphere,
creating a zone called the "ionosphere." The uppermost part of the
ionosphere, called the F layer, is so
thoroughly ionized that
some free electrons exist there - even at night - when the UV source
(the Sun) is not present. The F layer is
like a mirror for radio waves with frequencies below about 20 MHz.
Shortwave transmissions from earth hit
the F layer and bounce back down. In fact, many such bounces can occur,
and this is the reason why
over-the-horizon transmissions are possible at short wave frequencies.
As the Moon's shadow moves across the earth the temperature in the upper
atmosphere will drop, changing
the wind pattern
as air contracts in on the eclipse region. In the absence of UV
radiation from the Sun, the ionosphere rapidly
begins to decay.
The shadow of the moon races through the atmosphere at supersonic
speeds, causing wind and waves of
electron-ion
recombination to spread through the atmosphere from the eclipse region.
The effects could be global.
Folks, I think there will be a whole lot more to come. This article is
just touching the surface. MB
Mitch Battros
Producer - Earth Changes TV
http://www.earthchangesTV.com
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