omega effect

The "omega effect" is a concept within dynamo theory that explains how Earth's magnetic field is generated and sustained. This theory proposes that fluid motion within Earth's core creates electrical currents, which in turn produce a magnetic field. The omega effect specifically refers to the process where the rotation of the fluid core wraps magnetic field lines around the rotation axis, creating a toroidal field. This toroidal field is then further distorted by other fluid motions, contributing to the self-sustaining nature of the geomagnetic field. Geomagnetics is the broader scientific field that studies all aspects of Earth's magnetic field.12