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An excerpt from a paper by D.R. Fearn:
The problem of magnetic field stability is complementary to the (much more widely studied) kinematic dynamo problem The dynamo mechanism converts the mechanical energy of convection into magnetic energy. If the field generated is unstable then the instability extracts energy from the field and might be expected to limit the strength of field attainable. This is an important consideration since the toroidal part of the field in the Earth's core is shielded from us by the insulating mantle and we do not know its strength. [Measurements of the DC electrical potential near the top of the mantle have been extrapolated downward to estimate the toroidal field at the core-mantle boundary (CMB), ...). This gives a toroidal field strength of a few gauss ( at the CMB), but with a weakly conducting mantle, a low value is to be expected and this result is not inconsistent with a strong toroidal field in the interior of the core (...)] There are good reasons for believing the toroidal field may be significantly stronger than the observed (poloidal) part of the field. If so, theoretical considerations may be the only way we have of determining the strength of the major component of the field. Linear theory (...) has shown that a broad class of fields, characteristic of the Earth's field, are unstable when their maximum strength exceeds a value of the order of 60 gauss which is a factor 10 greater than the observed poloidal field but is in line with many estimates of the hidden toroidal field. (...) To explain the observed features of the geomagnetic field, it is clearly important to understand how a magnetic instability evolves.
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Why does the earth have its own magnetic field?
The Earth has its own magnetic field because of the movement of molten iron and nickel in its outer core. This movement generates electrical currents, which in turn create a magnetic field. The magnetic field plays a crucial role in protecting the Earth from harmful solar radiation and helps in navigation for animals that rely on Earth's magnetic field for direction.
How long does it take for the Earth's magnetic field to reverse?
The Earth's magnetic field can take thousands of years to reverse.
How does earth's magnetic field affect the compass?
Earth's magnetic field is what allows a compass to align itself with the magnetic poles, causing the needle to point north. The magnetic field provides a reference point for navigation, helping people determine their direction relative to the Earth's magnetic field. Any changes or disturbances in the magnetic field can affect the accuracy of a compass reading.
What is the Total magnetic field of the earth?
The total magnetic field of the Earth is approximately 25 to 65 microteslas. This field is a combination of the main magnetic field generated by the Earth's core and the smaller contributions from various external sources such as the ionosphere and magnetized rocks in the crust. The strength and direction of the Earth's magnetic field are continuously changing due to geophysical processes.
Why is earth magnetic field stronger near the equator?
The Earth's magnetic field is stronger near the equator because the magnetic field lines are more compressed at lower latitudes due to the shape of the field. Additionally, the core of the Earth, where the magnetic field originates, is tilted relative to the axis of rotation, causing the field to bulge towards the equator. This results in a stronger magnetic field near the equator.
Does Uruguay have a magnetic field?
The earth as a single object has a magnetic field. If Uruguay is part of the earth, it shares the earth's magnetic field.
What is resion of Earth magnetic field?
The Earth's magnetic field is the result of electrical currents flowing in the earth.
What creates the Earths magnetic field?
Scientists believe that it is the movements in the liquid outer core that create the magnetic field. Earth's magnetic field affects the whole planet.
Where the vertical component of earth's magnetic field is zero?
The vertical component of Earth's magnetic field is zero at the magnetic equator, where the magnetic field lines are horizontal. At the magnetic equator, the magnetic field lines run parallel to the Earth's surface, resulting in a zero vertical component.
What is the magnetic force of this planet called?
The magnetic force on Earth is called Earth's magnetic field or also the geomagnetic field.
Does the moon have a stronger magnetic field than the earth?
No, the moon does not have a global magnetic field like Earth. Some localized magnetic fields have been detected on the moon's surface, but they are much weaker than Earth's magnetic field.
Earth's magnetic field is believed to be generated from what region?
If you mean the region of influence of the earth's magnetic field then its called the earth's magnetosphere
Does the earth have a magnetc field?
Yes, the Earth has a magnetic field.
Which layer of the earth produces its magnetic field?
The earth's outer core produces the magnetic field.
What is the leading theory for what causes earth's magnetic field?
The Dynamo Theory it what causes Earth's Magnetic Field
What is the strength of the Earth's magnetic field in tesla?
The strength of the Earth's magnetic field is about 25 to 65 microteslas.
Why does the earth have its own magnetic field?
The Earth has its own magnetic field because of the movement of molten iron and nickel in its outer core. This movement generates electrical currents, which in turn create a magnetic field. The magnetic field plays a crucial role in protecting the Earth from harmful solar radiation and helps in navigation for animals that rely on Earth's magnetic field for direction.
