Secular variation across the oceans: A retrospective study from 35 years of shipboard total field measurements in the NE Atlantic

Details Secular variation across the oceans: A retrospective study from 35 years of shipboard total field measurements in the NE Atlantic Secular variation across the oceans: A retrospective study from 35 years of shipboard total field measurements in the NE Atlantic

Jun 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992nascp3153..203w&link_type=abstract

In NASA. Goddard Space Flight Center, Types and Characteristics of Data for Geomagnetic Field Modeling p 203-214 (SEE N92-28620

Computer Science

Data Processing, Geomagnetism, Oceans, Secular Variations, Comparison, Crossovers, Position (Location), Ships

Scientific paper

This is a pilot study to determine whether secular variation information can be retrieved from underway shipboard total field measurements with sufficient accuracy to complement geomagnetic data from land-based observatories. Applying the various new techniques described in this report, we extracted values of the total field at 42,677 crossovers or ship track intersection points contained in data sets collected between 18 degrees N and 50 degress N in the NE Atlantic, and extending temporally from 1955 to 1990. We used an edited subset of these total field values to derive the secular variation at 30,140 different locations in the study area, and compared the results with DGRF secular variation over the study area, calculated at 5 year intervals. The derived and DGRF values agree well, showing that indeed marine data can be a source for secular variations. However the analysis demonstrated that due to inherent noise in the marine data, only minor improvements on the DGRF values for the secular variation can be achieved.

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