Magnetic field of the Earth | ||||
Magnetic field of the Earth | Automatic translation | Updated June 01, 2013 |
The Earth's magnetic field reverses itself every 100,000 years or so, without respect this periodicity. This magnetic field (geodynamo) is produced by the movements of the alloys of iron and nickel in the molten liquid portion of the core of the Earth. Image: Reversal of the Earth's magnetic field according to Hubert Reeves: what impact on us or nature? |
Eccentricity and magnetic field | ||||
The eccentricity of the orbit of the planet would have an effect on the fluctuations of the angle and intensity of the geomagnetic field. | It ranges from 0 for a circular orbit at 1 for a highly elliptical orbit. But the eccentricity of Earth's orbit varies between 0 and 0.06 every 100,000 years. Image: Eccentricity, obliquity and precession are used as part of the astronomical theory of paleoclimates. | |||
Where the magnetic field is generated? | ||||
Scientists are trying to understand how works the magnetic field. It seems that the geomagnetic field of the Earth is generated by interactions between the inner core and outer creating a giant dynamo. | Measurements made on samples of Martian meteorites have shown that Mars has lost its magnetic field, because during the first 50 million years Mars had a strong magnetic field. Image: Lines of the picture represent the magnetic flux that flow from south pole of the core and return to the sphere from the magnetic north pole. |