Geomagnetically Induced Currents

Geomagnetically Induced Currents

Postby Johnston » Tue Jun 08, 2010 11:11 pm

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Hello, I have a question about geomagnetically induced currents.

I understand that these currents involve ten to hundreds of amps flowing through the earth's crust.

For the current to be that high, considering the crust would have a fairly high resistance compared to a standard conductor, the voltages involved must also be quite large.

(Ohm's Law, V = IR)

Shouldn't there also be heat generated in the upper mantle and lithosphere where these currents flow?

(Ohmic Heating, Q is proportional to I^2 R)
Johnston
 

Re: Geomagnetically Induced Currents

Postby Peter » Wed Jul 28, 2010 6:36 pm

As far as I am aware, such currents are only believed to flow in the iron core.

Since no currents are believed to run through the mantle, there is no heating due to such currents.


Last bumped by Anonymous on Wed Jul 28, 2010 6:36 pm.
Peter
 


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