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RV Polarstern |
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In marine geomagnetic survey usually tugged magnetometers are used. Sometimes,
for instance in the arctic sea, the use of tugged equipment is not possible.
Alternatively the measurement can be done by shipboard magnetometers. To conclude from the magnetic field values measured in the ship's coordinate system to the geomagnetic field values, the position of the ship (coures angle, pitch angle, roll angle) has to be know for each measured vector. This can be provided by the navigation system of the ship. Furthermore a correction matrix is needed to eliminate the permanent and inducted magnetic influence of the ship's body. This matrix can be determined by a connecting measurement under known field conditions. First tests on the Research Vessel Polarstern of the Alfred Wegener Institute show that this method is a suitable approach for geomagnetic measurements. The corrected data reached a relative accuracy of 10nT. An improoved version of the tested system will be permanently installed on the RV Polarstern. |
 RV Polarstern  Magetometer on RV Polarstern  Magetometers at the look-out |