It is important to realize that the position of the North Magnetic Pole given for a particular year is an average position. The Magnetic Pole wanders daily around this average position and, on days when the magnetic field is disturbed, may be displaced by 80 km or more. Although the North Magnetic Pole's motion on any given day is irregular, the average path forms a well-defined oval. The diagram shows the average path on disturbed days.

The cause of the North Magnetic Pole's diurnal motion is quite different than that of its secular motion. If we measure the Earth's magnetic field continually,   Read on ....http://gsc.nrcan.gc.ca/geomag/nmp/daily_mvt_nmp_e.php

Posted by Jay Roberts at 09:14 PM | Permalink