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azimuthal drift
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particle motion in Earth's magnetic field
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azimuthal drift

geophysics
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particle motion in Earth's magnetic field
particle motion in Earth's magnetic field The motion of single particles in Earth's magnetic field may be approximated by the superposition of their gyration about the main field, “bounce” along the field lines, and azimuthal drift in rings around Earth. The trajectories of individual particles in the ring current fill a doughnut-shaped volume of space. The current produced by the particle drift causes a decrease in the surface field (see text).

Azimuthal drift is a phenomenon in geophysics related to the movement of charged particles in Earth's magnetic field. This drift occurs because of two main factors: the decrease in magnetic field strength away from Earth and the curvature of magnetic field lines.1

Charged particles, such as protons and electrons, gyrate around magnetic field lines. Due to variations in field strength and line curvature, these particles tend to drift in rings around the Earth. Protons drift westward, while electrons drift eastward, creating an electric current. This process is fundamental to understanding phenomena like the Van Allen radiation belts and contributes to the secular variation of Earth's geomagnetic field, which includes a westward drift of magnetic anomalies.12

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2 Britannica Sources
  1. geomagnetic field - Secular variation of the main field
  2. geomagnetic field - The ring current

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