How does the Earth produces it's own magnetic field?

[dan020350]

I read an articles that the convection of the inner core of the Earth which is assume to be liquid metal produces Earth's magnetic field, is this true? Has scientists did a demo?

 

[Simon Bridge]

Yes and yes.
It's called the geomagnetic dynamo.
http://serc.carleton.edu/NAGTWorkshops/deepearth/visualizations/geodynamo.html

 

[dan020350]

Yes and yes.
It's called the geomagnetic dynamo.
http://serc.carleton.edu/NAGTWorkshops/deepearth/visualizations/geodynamo.html

Can it be produced in a small lab?

 

[Simon Bridge]

No. The Earth is quite large.

 

[Neon]

Differences in temperature, pressure and composition within the outer core cause convection currents in the molten metal as cool, dense matter sinks whilst warm, less dense matter rises. The Coriolis force, resulting from the Earth’s spin, also causes swirling whirlpools.

This flow of liquid iron generates electric currents, which in turn produce magnetic fields. Charged metals passing through these fields go on to create electric currents of their own, and so the cycle continues. This self-sustaining loop is known as the geodynamo.

 

[Mark44]

Differences in temperature, pressure and composition within the outer core cause convection currents in the molten metal as cool, dense matter sinks whilst warm, less dense matter rises. The Coriolis force, resulting from the Earth’s spin, also causes swirling whirlpools.

This flow of liquid iron generates electric currents, which in turn produce magnetic fields. Charged metals passing through these fields go on to create electric currents of their own, and so the cycle continues. This self-sustaining loop is known as the geodynamo.

@Neon, when you quote published material, as you have done above, you need to provide a citation, a reference to where you found the material. In some contexts you would be considered guilty of plagiarism.

I found what you copied here: http://www.physics.org/article-questions.asp?id=64, in the 5th and 6th paragraphs.

 

[Neon]

Mark i did just didnt have time to put the reference as my battery was 1 % and i just posted it. Afterwards i for got about it.Sorry