The frequency at which a charged particle circles around a magnetic field line, determined by the particle's charge, mass, and field strength.
Compound of 'gyro' (spinning) and 'frequency' (Latin frequentia). This physics term became standard in plasma and astrophysics in the 20th century.
Gyrofrequency is why trapped radiation belts surround Earth—electrons and protons get trapped in our magnetic field and spiral at specific frequencies, creating the Van Allen belts!
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