Entry from US English dictionary
A notional circle on the earth’s surface, the plane of which is equidistant between the north and south magnetic poles and perpendicular to the magnetic field.
- This is important as the physical and geomagnetic equators are not aligned in most parts of the world.
- Between 20º north and 20º south of the geomagnetic equator the ionosphere bends forming a protuberance.
- The electron concentration is thus depleted on the geomagnetic equator and enhanced in two regions, which locate approximately north and south 15° of the geomagnetic equator.
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