Mae Chow
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The magnetic poles wander a bit year to year 😉 It is believed that the magnetic poles have switched many times during the history of the earth 🙌 It can be seen in the magnetic orientations of the rock near the areas where the seafloor is expanding that this has been shown. When the lava rises out of cracks, it cools down and retains the magnet orientation of the earth’s current magnetic field. Magnetism is evident in the’s rocks finding on the seafloor. The north and south positions change. As the process of switching magnetic poles is slow, this won’t become an issue during our lifetimes. The last time the magnetism switched was 730,000 years ago. [1]
As you can see, location is a significant factor in determining where the compass points. You can see the angular differences between true north The declination, also known as magnetic north, is shown on Figure 6.7. It is indicated in degrees on your maps. The angle between magnetic north and true north will vary depending on where you live. The angle of declination in the United States varies between 20° west in Maine and 21° in Washington. See Figure 6.7. Earth’s magnetic fields are always changing. They move westward slowly (to 1 Degree every five years). A recent map is essential. Old maps will have a wrong declination, so all of your calculations using this declination angle won’t work. This distinction is crucial when using a map or a compass to navigate. [2]
The magnetic north pole is not indicated by a magnetic compass. Magnetic compasses point to earth’s magnetic poles. These poles are different from earth’s geographical poles. The south magnetic pole, located near the earth’s geographical north pole, is also the magnetic pole. In magnets, opposites attract. In other words, opposites attract in magnets. The north magnetic pole of a magnet is located close to the geo-north pole. A permanent magnet’s magnetic field line does not always follow the direction of the south magnetic pole. Thus, magnetic fields lines in the earth are drawn from the southern hemisphere to the northern. Last edited by Mark Godwin, Luoyang (China) 7 weeks ago [3]
Although they share some similarities, the Geographic North Pole and Magnetic South Pole are different. The Geographic North Pole is an unfixed geographical point marking the northernmost location on Earth, while the Magnetic North Pole is a constantly shifting pole of the planet’s magnetic field. Given the unpredictability of the Earth’s functions and the constant alterations in the planet’s magnetosphere, it is likely that the two North Poles will continue to diverge as the years continue. This is guaranteed to happen if the planet undergoes a geomagnetic reversal, which will cause many changes to the Earth’s surface. [4]
Article references
- http://www.appstate.edu/~goodmanjm/rcoe/asuscienceed/four3electricitymagnetism/mnvsgn.html
- https://www.princeton.edu/~oa/manual/mapcompass2.shtml
- https://wtamu.edu/~cbaird/sq/2013/11/15/why-does-a-magnetic-compass-point-to-the-geographic-north-pole/
- https://airlinkalaska.com/magnetic-north-pole-vs-geographic-north-pole/
