Skip to main content


Determination of the IGRF 2000 model


The IGRF 2000 has been estimated from magnetic measurements taken by the Ørsted sattelite in summer 1999. For this purpose, three models have been derived: The first two models were estimated using a few geomagnetic quiet days in May and September 1999, respectively. The third model, called Oersted(10c/99), was derived from scalar data spanning six months and vector data spanning four months. In order to get a model for epoch 2000.0, the IGRF 95 secular variaion model has been applied to the data. The IGRF 2000 model was taken to be the internal degree/order 10 portion of Oersted(10c/99). We describe the data selection, model parameterization, parameter estimation and an evaluation of the three models.


  1. Barton, C. E., International Geomagnetic Reference Field: the seventh gen eration, J. Geomag. Geoelectr., 49, 123–148, 1997.

  2. Langel, R. A. and R. H. Estes, The near-Earth magnetic field at 1980 deter mined from MAGSAT data, J. Geophys. Res., 90, 2495–2510, 1985.

  3. Olsen, N., et al., Ørsted initial field model, Geophys. Res. Lett., 27(22), 3607–3610, 2000.

  4. Olsen, N., T. Risbo, P. Brauer, J. M. G. Merayo, F. Primdahl, and T. Sabaka, In-flight calibration methods used for the Ørsted mission, in Ground and In-Flight Space Magnetometer Calibration Techniques, edited by A. Balogh and F. Primdahl, ESA SP-490, ESA Publishing Division, ESTEC, Katwijk, The Netherlands, 2001.

  5. Stern, D. P. and J. H. Bredekamp, Error enhancement in geomagnetic models derived from scalar data, J. Geophys. Res., 80, 1776–1782, 1975.

Download references

Author information

Correspondence to Nils Olsen.

Rights and permissions

Reprints and Permissions

About this article

Verify currency and authenticity via CrossMark


  • Euler Angle
  • Vector Data
  • Star Imager
  • Secular Variation Model
  • Scalar Magnetometer