Re: Would the Earth had magnetic pole if it would stop rotating

THANKS FOR VERY GOOD EXPLANATION

Jaga

On Aug 3, 11:13 pm, Sam Wormley <sworml...@xxxxxxxxx> wrote:
Jaga wrote:
here is the reply I received on yahoo answers. It makes quite a sense
to me but I did not know that the Earth core rotates faster than the
Earth itself. read it below:

"The Earth's magnetic poles would cease to exist if the Earth's core
stopped rotating independantly of the planet's rotation.

That is why the smaller planets (such as Mercury and Mars) have very
weak or non-existant magnetic fields, for their cores appear to have
solidified, also shown by the fact that they don't have plate tectonic
activity like Earth does.

Therefore their cores do rotate, but at the same rate as the planetary
rotation. The Earth's core rotates faster than the planet's spin,
giving us our magnetic field. "

Magnetic Field of the Earth
http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/magearth.html

Dynamo theory
http://en.wikipedia.org/wiki/Dynamo_theory

"In the case of the Earth, the magnetic field is believed to be caused
by the convection of molten iron, within the outer liquid core, along
with a Coriolis effect caused by the overall planetary rotation that
tends to organize currents in rolls aligned along the north-south polar
axis. When conducting fluid flows across an existing magnetic field,
electric currents are induced, which in turn creates another magnetic
field. When this magnetic field reinforces the original magnetic field,
a dynamo is created which sustains itself. Similar magnetic fields are
present in many celestial bodies including most stars such as the Sun
(which contains conducting plasma) and active galactic nuclei".

Molten core solves mystery of Mercury's magnetic field
http://physicsweb.org/articles/news/11/5/7/1

4 May 2007

Being the closest planet to the Sun, you might think Mercury would be
the most likely rocky planet in the Solar System to have a molten
core, but for the past three decades physicists have not been quite
so sure. By taking radar measurements of Mercury using ground-based
radio telescopes, however, physicists in the US and Russia claim to
have proved that the variation in the planet's spin rate is indeed
characteristic of a molten core. Their work also lends weight to the
idea that Mercury, like Earth, produces its magnetic field in the
molten core through dynamo action (Science 316 710).

Despite its 400 °C surface temperatures, physicists originally
predicted that Mercury's small mass -- about 5% that of the Earth --
would have allowed its core to cool down enough to solidify long ago.
But their predictions became much less certain in the 1970s after
NASA's Mariner 10 spacecraft flew by the planet and detected a small
internal dipole magnetic field. Although some claimed that the field
could have been a fossil of an earlier one "frozen" into the crust,
others maintained that this was very unlikely, and that dipole
magnetic fields in terrestrial planets are normally a result of the
convection of molten iron producing a dynamo.

See:http://physicsweb.org/articles/news/11/5/7/1- Hide quoted text -

- Show quoted text -


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