You may not have known, but the magnetic north pole of the planet Earth moved in two years by the distance between Belgrade and Novi Sad. The geographic and magnetic north poles are not at the same point (looking from our space, they are close enough for a passenger to identify them with a compass). However, the magnetic pole does not even stand in one place, but it is a walking point.

Namely, at the beginning of the 20th century, the magnetic pole was in Canada, and now it has already passed Greenland. According to Michael Brooks in the article “What’s wrong with the North Pole” in the magazine New Scientist, during the last 18 years, the pole has fled to the east at a speed of 40 kilometers a year and is currently moving towards Siberia.

The strange behavior of the Earth’s magnetic field does not end there. There were times when the field changed polarity, as evidenced by the traces of the movement of textual plates and volcanic lava. Certainly, then the compass needle had to go to the point we call the South Pole.

The compass, a simple mechanical device for orienteering in space, which sailors have been using for more than 800 years, consists of a magnetic needle that always rotates towards the magnetic north of the planet. It has been known since the 17th century that the secret of the compass lies in the magnetism of the Earth.

The very question of where the Earth comes from is somewhat more complex, and in 1919 the so-called “dynamo model” of the Irish physicist Joseph Larmore will successfully answer it. The model describes the behavior of a ball of liquid iron in the core of the Earth (or other celestial body) that moves and is electrically conductive at the same time, thus creating a magnetic field for the planet. It turns out that turbulent movements in the layers of the core affect the shape of the field, and thus the change in the position of the magnetic pole.

Although the magnetic field is more vivid than one might think, it is extremely valuable for life on Earth because it protects the planet from radiation. There are planets that have completely lost their magnetic field, such as Mars, which lost its own 4 billion years ago.

The map of the surroundings of the North Pole was created in 1895 and was used with stories about expeditions to the unexplored polar region (of course, assuming that the magnetic pole does not change place).

Leave a Reply