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Introduction
Experiencing the most powerful geomagnetic storm in May 2024 since March 1989, with aurorae produced at far more equatorial latitudes than usual in both hemispheres, raises the question of which effects the variation in the geomagnetic field has on magnetometer prospecting.
The anomalies we measure in magnetometer prospecting depend on the geomagnetic field. Of interest is the anomaly caused in comparison to the unperturbed field due to the field in the presence of a perturbation caused by the anomalous body. The unperturbed field is dominated by the intensity of the geomagnetic field. It experiences variations throughout the day, hence diurnal variation, mainly caused by electric currents induced in the ionosphere driven by solar activity. Enhanced energy from solar winds cause major disturbances, and called ‘geomagnetic storms’.
Given that the size of diurnal variation is a few tens o...
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