The "geomagnetic North Pole" here refers to the North Pole. The concept of the North Pole refers to the northern end of the magnetic needle. According to this definition, if we think of geomagnetism as a big magnet, according to the principle that like poles repel and opposite poles attract, the geomagnetic North Pole is naturally near the geographical South Pole. Otherwise, the north pole of the compass cannot point to the north, but to the south (only consider geomagnetic factors and ignore other influences).

So why is the geomagnetic pole north-south? The answer is related to the flow direction of the core liquid metal.

The earth turns from west to east, driving the liquid metal in the core to turn from west to east There are a large number of free-moving electrons in liquid metal, which flow with the flow of the core, forming a ring current from east to west (the direction of current is the direction of positive charge). The plane of this annular current is almost perpendicular to the rotation axis of the earth, so the direction of the earth's magnetic pole is along the north-south direction.

Note: the direction of the magnetic pole is determined by the flow direction of the iron core. But the flow direction of the core is not determined by the rotation of the earth, but only influenced by it. The flow of the earth's core is very complicated, and scientists are still studying it (combined with the study of the direction of the earth's magnetic pole) ...

Incidentally, it is only used in China to explain the geomagnetic North Pole as the definition of the North Pole. However, the international unified interpretation is not the case. The international definition of geomagnetic pole is: the intersection of the strongest point of geomagnetic field and the line connecting the earth surface. According to this definition, the geomagnetic north pole must be near the geographical north pole, not the geographical south pole. Please pay attention to this domestic and international difference.