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Πέμπτη 8 Οκτωβρίου 2015

The Wailing Cry of A Meteor Shower

    

The Wailing Cry of A Meteor Shower



Δημοσιεύτηκε στις 7 Οκτ 2015
Ever
wonder what a meteor shower sounds like as it streaks across the
Earth's atmosphere at hypersonic, air-ionizing speeds? Well now you do!

Each
time a meteor crosses the atmosphere, it leaves behind a short trail of
ionised particles (plasma). This trail reflects high-frequency radio
signals from stations broadcasting all around the world for just a few
seconds. The motion of the meteor trail due to the changes in upper
atmosphere winds changes the frequency of the reflected signal (due to
the Doppler effect) so that it is of a higher frequency when the trail
is moving toward the radio detector station and at a lower frequency
when moving away from the radio detector station. What you 'hear' then
is the trail as it is blown around by the winds before it is eventually
dispersed.

The Leonid Meteor Shower, from which these signals
were taken, is annually active in the month of November each year and
usually peaks around November 16 or 17. The shower is called Leonids
because its radiant or the point in the sky where the meteors seem to
emerge from, lies in the constellation Leo.

The meteors do not
come from the constellation itself however and instead occur when the
Earth passes through the debris left by the comet Tempel-Tuttle. From
our perspective the Earth's orbit passes through the debris in the
direction of Leo. The comet takes around 33 years to make one orbit
around the Sun.

People can view about 20 meteors an hour at the peak of the Leonids meteor shower.
ANAΡΤΗΣΗ ΑΠΟ ΤΟ  ΥΟUTUBE 9/10/2015

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