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The transient ground magnetic signatures associated with a chain of travelling convection vortices
comprise just one of a wide variety of oscillatory signatures detectable by ground magnetometers.
They are classified by their continuous (Pc) or irregular (Pi) waveform and by their
frequency band (Pc1 to Pc6 or Pi1 to Pi3). They may be further sub-classified by their physical
origin. The numerical and physical classifications are summarised in the figure (Saito, 1978).
Often the pulsations are hidden within larger amplitude fluctuations. Standard signal analysis
techniques such as band-pass filtering may be used to study the waves in greater detail as required.
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