Geomagnetic induction...

[Externet]

If the earth magnetic field does not spin together with the earth, should cause some induction in wires fixed to earth surface (as power transmission wires, pipelines) and to wiring within a geostationary satellite, is that right ?

If the earth magnetic field does spin synchronized/together to earth rotation, the wiring in geostationary satellites should not experience induction from crossing magnetic lines of force; is that right ?

[studiot]

The Earth's field is quite weak in comparison to the fields in useful human devices.

 

By comparison the Earth's field is 25 t0 65 microtesla at the surface.

[Externet]

Thank you very much for the response as you always assist to help, studiot.  But that is not about the questions.

[studiot]

10 hours ago, Externet said:

Thank you very much for the response as you always assist to help, studiot.  But that is not about the questions.

Well it was and it wasn't.

The Earth as a whole rotates from West to East

The solid inner core rotates slightly (less than a second a day) faster than the outer layers (mantle and crust) of the Earth, but in the same direction.

The liquid out core rotates slightly (by a similar amount) more slowly in the same direction. Beware this leads to the newspaper headlines that the core or outer core rotates in a different direction to that of the Earth. This is only true relative to the surface of the Earth and this 'backward' rotation or slip, takes moe than a full century to complete one revolution.

 

So the lines of flux sensibly rotate with the Earth.

So only those conductors achieving significant speed relative to the Earth (surface) will experience any induction by cutting the lines of flux of the Earth's magnetic field, and this will be due to their own speed, not that of the rotating flux lines.

Further any induction will be small since the flux is small, as shown by the previous post unlees enormous speeds are achieved. Perhaps swansont can tell you more about satellites.

[Externet]

Thanks again.

So the lines of flux rotate together with the earth.

Question was triggered by the so called Faraday paradox.   And a comment from someone attempting to explain as  'field lines do not rotate when its magnet source rotates along its N-S axis'

The -agreed- very faint lines of force from earth should not be much of a trouble to non-geostationary satellites circuitry.  But to be considered in sensitive equipment.  I read about the multiple failures from tethered satellites, which do cross lines of force at brutal speeds and their many mechanical failures. ----> https://en.wikipedia.org/wiki/Space_tether_missions

[studiot]

Note I have been careful to indicate my frame of reference (point of view) for the rotation.

Your discussion elsewhere may be being conducted from diferent points of view.

[interested]

On 1/31/2018 at 9:25 AM, studiot said:

The solid inner core rotates slightly (less than a second a day) faster than the outer layers (mantle and crust) of the Earth, but in the same direction.

The liquid out core rotates slightly (by a similar amount) more slowly in the same direction. Beware this leads to the newspaper headlines that the core or outer core rotates in a different direction to that of the Earth. This is only true relative to the surface of the Earth and this 'backward' rotation or slip, takes moe than a full century to complete one revolution.

Do you have any opinion as to why the earths magnetic field flips every 50000 years or so, as evidenced in magnetite rocks and on the ocean floors etc. 

[studiot]

On 03/02/2018 at 12:32 PM, interested said:

Do you have any opinion as to why the earths magnetic field flips every 50000 years or so, as evidenced in magnetite rocks and on the ocean floors etc. 

The best model we currenly have is the Rikitake Dynamo.

This is compatible with fractal/chaos theory.

https://www.google.co.uk/search?source=hp&ei=aBF3WvKnA-qXgAbI76LADA&q=Rikitake+dynamo&oq=Rikitake+dynamo&gs_l=psy-ab.3...11840.15506.0.16087.15.15.0.0.0.0.149.1265.10j5.15.0....0...1c.1.64.psy-ab..0.7.727...0j46j0i131k1j0i46k1j0i10k1.0.R2P1_uSh1Wo

Books

Fractals in Geology and Geophysics

Turcotte

Cambridge University Press

p279 ff

Edited February 4, 2018 by studiot