What's the origin of the earth's magnetic field?

Question

well? simple enuf, right (=

Answer 1

No-one knows this for sure, it's still quite a mystery.

Earth's magnetic field is created by the turbulent motion of electrically conductive fluid, most of which is iron. However, since these interactions occur deep within the Earth, measuring and observing them directly is almost impossible.

Answer 2

rather a lot of molten iron

Answer 3

No one knows exactly from where the earth's magnetic field is generated. There are many theories about it.

One theory suggest that it is because of molten iron rotating inside the earth's core due to rotation of the earth.

Another theory says that it is because of the rotation of the gaseous ions present in the upper layer of the atmosphere.

You can check the internet to learn more about it.

Answer 4

The Earth's magnetic field is caused mostly by electric currents in the liquid outer core.

Convection of molten iron within the outer liquid core, along with a Coriolis effect caused by the overall planetary rotation, tends to organize these electric 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.

Answer 5

The sun .is originally the source that creates the magnetic fields that attract all planets to it

origin in earth is unknown maybe some where in the core  

Answer 6

The revolving iron core of the Earth    

Answer 7

Wikipedia, comments, 'The strength of the field at the Earth's surface ranges from less than 30 microteslas (0.3 gauss) in an area including most of South America and South Africa to over 60 microteslas (0.6 gauss) around the magnetic poles in northern Canada and south of Australia, and in part of Siberia.

The field is similar to that of a bar magnet, but this similarity is superficial. The magnetic field of a bar magnet, or any other type of permanent magnet, is created by the coordinated spins of electrons and nuclei within the atoms. The Earth's core, however, is hotter than 1043 K, the Curie point temperature at which the orientations of spins within iron become randomized. Such randomization causes the substance to lose its magnetic field. Therefore the Earth's magnetic field is caused not by magnetized iron deposits, but mostly by electric currents in the liquid outer core.

Convection of molten iron, within the outer liquid core, along with a Coriolis effect caused by the overall planetary rotation that tends to organize these "electric 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. This is called the "Dynamo Theory" and it explains how the earth's magnetic field is sustained.

Another feature that distinguishes the Earth magnetically from a bar magnet is its magnetosphere. At large distances from the planet, this dominates the surface magnetic field. Electric currents induced in the ionosphere also generate magnetic fields. Such a field is always generated near where the atmosphere is closest to the Sun, causing daily alterations which can deflect surface magnetic fields by as much as one degree.'