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Results tagged with geomagnetism
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user 52112
Geomagnetism covers questions related to the Earth’s magnetic field, its origin, history and measurement. Use electromagnetism for more general questions on magnetism.
2
votes
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Geomagnetic reversal?
What is the origin of the geomagnetic field?
The Earth's magnetic field can't be a permanent bar magnet. Permanent bar magnets aren't that permanent. A bar magnet would only last a few tens of thousan …
- 42k
1
vote
Accepted
How is north defined for any point on the surface of the earth?
The Earth rotates around an axis. Denote the unit vector directed along this axis (with the direction determined by the right hand rule) as $\hat z$. This rotational axis is key in finding "north". I …
- 42k
23
votes
Venus, Earth and Mars Magnetic fields
A geodynamo requires a fluid that can carry a current. A widely held but incorrect explanation for Mars' lack of a magnetic field is that Mars' core is frozen solid. Gravitational observations of Mars …
- 42k