Articles | Volume 6, issue 2
Geosci. Instrum. Method. Data Syst., 6, 361–366, 2017
https://doi.org/10.5194/gi-6-361-2017

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

Geosci. Instrum. Method. Data Syst., 6, 361–366, 2017
https://doi.org/10.5194/gi-6-361-2017

Research article 25 Sep 2017

Research article | 25 Sep 2017

In situ vector calibration of magnetic observatories

Alexandre Gonsette, Jean Rasson, and François Humbled Alexandre Gonsette et al.
  • Centre de Physique du Globe, Royal Meteorological Institute, 5670 Dourbes, Belgium

Abstract. The goal of magnetic observatories is to measure and provide a vector magnetic field in a geodetic coordinate system. For that purpose, instrument set-up and calibration are crucial. In particular, the scale factor and orientation of a vector magnetometer may affect the magnetic field measurement. Here, we highlight the baseline concept and demonstrate that it is essential for data quality control. We show how the baselines can highlight a possible calibration error. We also provide a calibration method based on high-frequency absolute measurements. This method determines a transformation matrix for correcting variometer data suffering from scale factor and orientation errors. We finally present a practical case where recovered data have been successfully compared to those coming from a reference magnetometer.

Download
Short summary
We present a novel method for calibrating magnetic observatories. We show how magnetometer baselines can highlight a possible calibration error. We also provide a method based on high-frequency automatic absolute measurements. This method determines a transformation matrix for correcting raw data suffering from scale factor and orientation errors. We finally present a practical case where covered data have been successfully compared to those coming from a reference magnetometer.