The spinning Astrid-2 satellite used for modeling the Earth's main magnetic field

José M.G. Merayo, P.S. Jørgensen, T. Risbo, Peter Brauer, Fritz Primdahl, J. Cain

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Abstract

The Swedish micro-satellite Astrid-2 was successfully launched into a near polar orbit in December 1998. Despite the fact that the primary science mission was auroral research, the magnetic instrument was designed to accomplish high-resolution and high-precision vector field magnetic measurements, and therefore mapping of the Earth's magnetic field was possible. The spacecraft spins about a highly stable axis in space. This fact and the globally distributed data make the magnetic measurements well suited for the estimate of a magnetic field model at the spacecraft altitude (about 1000 km). This paper describes the initial analysis of the Astrid-2 magnetic data. As a result of the study of a single day (February 7, 1999), magnetically fairly quiet, it was possible to in-flight adjust the calibration of the magnetometer and find a magnetic field model fitting the scalar component of the measurements to better than 5 nT(rms) for latitudes Equatorward of 50degrees. Several methods for field modeling are discussed in this paper under the assumption that the direction of the spin axis in inertial space is nearly constant, and this assumption is corroborated by the observations. The approximate inertial orientation of the magnetometer could then be determined simultaneously with the instrument intrinsic calibration and the estimate of main field model coefficients. Hence, apart from the scientific use of the magnetic data, the attitude of the spacecraft may be estimated with high precision.
Original languageEnglish
JournalI E E E Transactions on Geoscience and Remote Sensing
Volume40
Issue number4
Pages (from-to)898-909
ISSN0196-2892
DOIs
Publication statusPublished - 2002

Bibliographical note

Copyright: 2002 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE

Keywords

  • modeling
  • geophysical inverse problems
  • data models
  • magnetic field measurement
  • data processing
  • Amorphous magnetic materials
  • geomagnetism
  • magnetic fields
  • calibration
  • satellites
  • magnetometers
  • measurement

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