Articles | Volume 6, issue 2
Geosci. Instrum. Method. Data Syst., 6, 439–446, 2017
https://doi.org/10.5194/gi-6-439-2017

Special issue: The Earth’s magnetic field: measurements, data, and applications...

Geosci. Instrum. Method. Data Syst., 6, 439–446, 2017
https://doi.org/10.5194/gi-6-439-2017

Research article 26 Oct 2017

Research article | 26 Oct 2017

Fog-based automatic true north detection for absolute magnetic declination measurement

Alexandre Gonsette, Jean Rasson, Stephan Bracke, Antoine Poncelet, Olivier Hendrickx, and François Humbled Alexandre Gonsette et al.
  • Dourbes magnetic observatory, Royal Meteorological Institute of Belgium, Dourbes, 5670, Belgium

Abstract. Absolute magnetic measurements are of great importance in magnetic observatories. They allow not only instrument calibration but also data quality checking. They require the vertical and the geographic or true north as reference directions, usually determined by means of a level and by pointing an azimuth mark, respectively. We present here a novel system able to measure the direction of the magnetic field and of the vertical and true north. A design of a north seeker is proposed taking into account sensor bias as well as misalignment errors. Different methods are derived from this model and measurement results are presented. A measurement test at high latitude is also shown.

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Short summary
Absolute magnetic measurements require the vertical and the geographic north as reference directions. We present here a novel system able to measure the direction of the magnetic field and of the vertical and true north. A design of a north seeker is proposed that takes into account sensor bias as well as misalignment errors. Different methods are derived from this model and measurement results are presented. A measurement test at high latitude is also shown.