The magnetic field of Earth, including its internal and externally driven contributions. Its magnitude and direction vary in space and time.
The horizontal angle from geographic north to magnetic north, conventionally positive eastward. A survey profile direction and the inducing field's magnetic declination together determine the in-profile horizontal field component.
The angle of the geomagnetic field to the horizontal, conventionally positive downwards. It controls the skew and polarity pattern of an induced total-field magnetic anomaly.
An international reference model of the large-scale internal geomagnetic field. Subtracting it defines a reference residual; it does not remove local cultural sources or all external time variation.
A substantial time-dependent disturbance of the geomagnetic field driven by space-weather conditions. Rapid irregular changes can degrade a magnetic survey even after base correction.
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