Open AccessA comparison of time and frequency domain geomagnetic sounding
Author(s) -
Beamish David
Publication year - 1983
Publication title -
geophysical journal of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0016-8009
DOI - 10.1111/j.1365-246x.1983.tb03340.x
Subject(s) - earth's magnetic field , depth sounding , frequency domain , geodesy , time domain , geology , geophysics , earth's rotation , mathematics , physics , magnetic field , mathematical analysis , computer science , oceanography , quantum mechanics , computer vision
Summary. A three‐site geomagnetic data set from the Borders region of southern Scotland is used to examine the empirical relationships established by differential geomagnetic sounding experiments. A time domain analysis of such relationships reveals time domain transfer functions which appear to be almost independent of time. A frequency domain analysis is then used to illustrate both a significant phase rotation and a significant dependence on period of the equivalent frequency domain response functions. The formalism of conventional geomagnetic sounding is re‐examined. It is found that difference fields are not required to establish the appropriate horizontal field relationships.