Skip to content
Open Access

Calibration of the Ørsted vector magnetometer

  • Nils Olsen1Email author,
  • Lars Tøffner-Clausen2,
  • Terence J. Sabaka3,
  • Peter Brauer4,
  • Jose M. G. Merayo4,
  • John L. Jørgensen4,
  • J. M. Léger5,
  • Otto V. Nielsen4,
  • Fritz Primdahl1, 4 and
  • Torben Risbo6
Earth, Planets and Space201455:BF03352458

https://doi.org/10.1186/BF03352458

Received: 1 July 2002

Accepted: 26 November 2002

Published: 21 June 2014

Abstract

The vector fluxgate magnetometer of the Ørsted satellite is routinely calibrated by comparing its output with measurements of the absolute magnetic intensity from the Overhauser instrument, which is the second magnetometer of the satellite. We describe the method used for and the result obtained in that calibration. Using three years of data the agreement between the two magnetometers after calibration is 0.33 nT rms (corresponding to better than ± 1 nT for 98% of the data, and better than ± 2 nT for 99.94% of the data). We also report on the determination of the transformation between the magnetometer coordinate system and the reference system of the star imager. This is done by comparing the magnetic and attitude measurements with a model of Earth’s magnetic field. The Euler angles describing this rotation are determined in this way with an accuracy of better than 4 arcsec.

Keywords

Euler AngleEarth Planet SpaceScalar CalibrationStar ImagerVector Magnetometer