Working Group V-MOD: Geomagnetic Field Modelling

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International Geomagnetic Reference Field : Older versions

IGRF11 is released. Download the latest IGRF model here : IGRF-11 coefficients (text file, excel spreadsheet)

Older versions of the IGRF models may be downloaded from this page. If you are looking for a model of the geomagnetic field since 1900, you should use the latest IGRF-11 model which is updated retrospectively. However, older versions of the IGRF may be required in special cases. For example, if a magnetic survey was conducted in 1983, the appropriate predictive IGRF-3 (available at that time) would have been subtracted to make an anomaly map. If the original data are no longer available to update the MAP, one has to add the IGRF-3 to the anomaly map and then subtract IGRF-11 which includes the required definitive DGRF model for the period 1980-1985.


Model

Main Field

Secular Variation

Release Year
1965.0
1975.0-1980.0

1965
1965.0-1975.0
1980.0-1985.0

1975
1965.0-1980.0
1980.0-1985.0

1980
1945.0-1985.0
1985.0-1990.0

1985
1945.0-1985.0
1985.0-1990.0

1987
1945.0-1990.0
1990.0-1995.0

1991
1900.0-1995.0
1995.0-2000.0

1995
1900.0-2000.0
2000.0-2005.0

2000
1900.0-2000.0
2000.0-2005.0

2003
1900.0-2005.0
2005.0-2010.0

2005
1900.0-2010.0
2010.0-2015.0

2010

The IGRF is a series of mathematical models of the Earth's main field and its annual rate of change (secular variation). The 11 th Generation IGRF coefficients were computed from candidate sets of coefficients produced by the participating members of IAGA Working Group V-MOD. Their institutes and the many organisations involved in operating magnetic survey satellites, observatories, magnetic survey programmes and World Data Centers are to be thanked for their continuing support of the IGRF project.

For page content questions please contact: Christopher Finlay
Webpage Maintained by: Manoj Nair
Hosted by: WDC for Solid Earth and Geophysics

URL: http://www.ngdc.noaa.gov/IAGA/vmod/igrf_old_models.html
Revised: 17 March, 2010


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