An Application of Total-Field Magnetic Fluctuation Data to Geomagnetic Induction Studies

Abstract

The possibility is explored of using total-field fluctuation records to give information on local geomagnetic induction. Total-field fluctuation records will not usually be accompanied by local horizontal fluctuation records, and as a replacement for the latter the use of distant observatory records may be possible. Several examples are given, based on records of instruments which have operated to monitor magnetic activity for the benefit of aeromagnetic survey parties. Transfer functions are computed which appear useful as a guide in a reconnaissance study of geomagnetic induction.
The use of total-field fluctuation recordings made remote from an observatory may have several applications, such as to studies of geomagnetic induction at sea. The operation of total-field recording instruments in arrays which contain a small number of stations recording three components of magnetic fluctuations may have application to studies of continental induction.