Transcript The Aurora Borealis

The Aurora Borealis
MUSIC BY: Carmina Burana
Composer: Carl Orff,in the year 1936
Perormed by: The Boston Symphany Orchestra
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Since the World began, Solar Lights have been an Integral part
of our planet Earth. They do not depend at all on the human
activity, but rather on that of the Sun and the terrestrial
magnetic field.
The Dawn is not as one once believed (until some 70 years
ago), that causes the reflection of solar light on the ices of the
Arctic.
However, it is indeed the Sun, which is responsible for the
Polar Lights as the turbulent surface of the Sun rejects into
the space the atoms and the subatomic particles (protons,
electrons).
At the time of violent solar storms, a great quantity of
electrons and protons coming from the Sun arrive in the
terrestrial atmosphere and activate the nitrogen and oxygen
atoms, which become suddenly luminous and produce the
splendid veils (ribbons or curtains) of coloured light, which
are the polar lights.
Aurore North & South
They are named Polar because once arrived in the terrestrial
atmosphere, the particles are taken by the trap of the
magnetic field, which forces them to move towards the
magnetic poles either north (Northern Lights) or in the south
(Aurora Australis)
Dawn with the shape of a thin elliptic band (the auroral oval) is
centred on the magnetic north and south poles, i.e.
approximately within 700 meters of the geographical poles.
The size of this form depends on the solar activity: the more
the Sun is quiet" and the solar wind calm the oval is smaller;
conversely the more the solar wind strikes the terrestrial
magnetic field with force and gusto, more the dawn becomes
broad and extends.
The Affect of the Solar
atmosphere
The temperature of the solar atmosphere is several million
degrees Kelvin (temperature
°C = temperature °K - 273,15).
At these temperatures, the collisions between the particles are
so violent that the hydrogen atoms break up into electrons and
protons.
This “material" is called ionized plasma.
The Solar wind is when this plasma moves away from the sun
in all the directions. transports the Solar Magnetic Field into
interplanetary space. The speed and the density of this solar
wind vary greatly. They are larger when the wind comes from
the active areas of the sun, like the solar spots or
protuberances.
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