Arctic polar stereographic images of declination with the north dip magnetic pole and blackout zone indicated. Source: NOAA NCEI
Positions of the north (left) and south (right) dip poles (red) and the geomagnetic poles (blue) from 1900.0 to 2030.0, estimated from the 14th Generation IGRF / Source: BGS
Figure 12: Rate of change of declination at Greenwich (GRW), Abinger (ABN), Hartland (HAD), Eskdalemuir (ESK) and Lerwick (LER) observatories
Using direct observations of the magnetic field over the past 400 years, the pattern of declination seen at the Earth's surface appears to be moving slowly westwards. ÆÐÅÏÀÌ Áö±¸ Ç¥¸é¿¡¼ ¼ÂÊÀ¸·Î ´À¸®°Ô À̵¿ Áß
These sudden changes are known as jerks or impulses and, at the present time, are not well understood and are certainly not predictable. Some researchers have found evidence for a correlation with length-of-day changes.
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