| dc.description.abstract | Forsvarets forskningsinstitutt accomplished in September 1991 a pilot study investigating fluctuations in the earth's
magnetic field in a coastal water area in Norway. The experimental data was collected during seven days using four
bottom-mounted three-axial fluxgate magnetometers sampled at 2 Hz and the paper describes the experiment and some
of the results found. The long-time series are analysed with respect to power spectral density, squared coherence and
phase shifts/time delays. A subtraction filter is introduced to reduce the ambient noise. The results are compared with
results from other, equivalent measurements of fluctuations in the geomagnetic field. This report was originally
presented as a paper at the conference Marelec'97 in London, June 1997. | en_GB |