Geomagnetic Jerks And How Can They Help Scientists Predict Earth’s Magnetic Field Behavior


Geomagnetic jerks were first described in 1978 as random events that abruptly accelerate the evolution of the Earth’s magnetic field. Our planet’s magnetic fields sometimes affect human activities from the flight of low-altitude satellites to establishing the direction in smartphones. In over forty years of activity of geophysicists, the geomagnetic fields have caused some problems, and because of that, it’s essential to predict its evolution.

What Is the Process Behind Those Geomagnetic Jerks?

The circulation of matter creates our planet’s magnetic field into its metallic core, and the energy is released after that when the core cools down. We know about two types of movements that could cause two types of variations in the magnetic field.

The first type of variations is resulting from slow convection movement, and it can be detected on the scale of a century. On the other hand, the second type of change is rapid, it’s resulting from hydromagnetic waves, and it can be discovered on the scale of a few years. The scientists believe that the second type of variations is playing an essential role in the geomagnetic jerks.

How Can the Scientists Find Out a Better Way to Predict the Earth’s Magnetic Field?

A computer simulation was developed by Julien Aubert from L’Institut de Physique du Globe de Paris (IPGP) and the Technical University of Denmark (DTU). The computer simulation has recreated the physical conditions of our core. This simulation required the equivalent of 4 million hours of calculation with the help of the supercomputers of GENCI.

Also, they reproduced the succession of events leading to geomagnetic jerks. They have reproduced the simulation from hydromagnetic waves from the inner core that are amplified as they approach the core’s surface. That is causing magnetic disturbance comparable with the jerks. Having a better comprehension of these geomagnetic jerks could help the scientists to identify the cause of magnetic field variation, and to study the physical properties of the Earth’s core.


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