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Geomagnetism: The Magnetic Field of the Earth (677 words) |
 | The geomagnetic field model is also vital to various kinds of magnetic surveys, such as those used in mineral exploration and the mapping of hazardous earthquake faults. |
| The magnetic field's strength and direction and their rates of change are predicted every 5 years for a 5-year period. |
| The influence of this distortion of the geomagnetic field is quite small near Earth's surface (except during solar eruptions associated with sunspots) and becomes larger with increasing distance from Earth. |
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Magnetic field detectors, compasses, viewers, powdered iron filings (301 words) |
| agnetic field viewers and compasses are useful accessories for detecting the presence of magnetic fields and for illustrating their 3 dimensional structure. |
| A magnaprobe consists of a gimbal mounted magnet that is free to rotate in 3D. |
| Magnetic compasses are the simplest of accessories for use with magnets. |
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