1. Aircraft flying polar routes near the geomagnetic poles are at particular risk. 2. It is actually an oval centered on the geomagnetic poles . 3. Geomagnetic poles cannot be reliably determined for Devonian or older rocks thanks to the folding.4. Over several thousand years, the average location of the geomagnetic poles coincides with the geographical poles. 5. However, the approximation is imperfect, and so the Magnetic and Geomagnetic Poles lie some distance apart. 6. The "'geomagnetic poles "'are antipodal points where the axis of a best-fitting dipole intersects the Earth's surface. 7. To analyze global patterns of change in the geomagnetic field, geophysicists fit the field data to a geomagnetic poles . 8. Poker Flat lies under the auroral zone, a doughnut-shaped expanse of sky around Earth's geomagnetic pole near Thule, Greenland. 9. The frequency of Earth's field NMR for protons varies between approximately 900 Hz near the equator to 4.2 kHz near the geomagnetic poles . 10. If the Earth's field were exactly dipolar, the north pole of a magnetic compass needle would point directly at the North Geomagnetic Pole .
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