Geomagnetic Field Models at NGDC

Geomagnetic Models and Software Available from NGDC

The Epoch 2000 Models are now available. NGDC archives and distributes two magnetic field models, the International Association of Geomagnetism and Aeronomy (IAGA) International Geomagnetic Reference Field (IGRF) model and the Department of Defense (DoD) World Magnetic Model. You can download the models for use on your own machine, or use our online software to compute values from the current IGRF model. Before using the IGRF please look at the 'Health Warning'.

Magnetic storms are sudden and potentially large disturbances in the magnetic field which may last hours or days. Forcast information on magnetic storms is available through the NOAA Space Environment Center www site, or through a recorded message service at 303-497-3235.

Download the current NGDC GEOMAG software and the IGRF and WMM model:

	GEOMAG for PC platform - includes models and documentation
	GEOMAG for Unix platform - includes models
	IGRF model self-extracting zip file.
	Browse NGDC's Model ftp site

Download IAGA's current International Geomagnetic Reference Field (IGRF)

	Visit the IAGA Web to learn more about the IGRF.
	IAGA's IGRF2000 and documentation from the IAGA ftp
	Images of the Earth's Main Magnetic Field from the IGRF

Download the current DoD World Magnetic Model (WMM)

	For more information, visit the DoD WMM web
	C Code, or
	Fortran Code

Download the collection of Utility Programs including (partial list):

	GMCORD program which determines the geomagnetic coordinates for any selected global location.
	SQ1MODEL program which produces an estimate of the daily variation of field for any global location
	DSTDEMO program illistrates the change of the DST mid-latitude fields during a storm
	SUNMOON program gives the position of the Sun and Moon for any observer latitude, longitude and selected time

Visit the Main Field Magnetism ftp site.

Access to the Auroral Electrojet Index, AE

NGDC has more information of the Earth's magnetic field as well as answers to some frequently asked questions.

For content questions please contact: Susan McLean

URL: http://www.ngdc.noaa.gov/seg/potfld/magmodel.shtml
Last modified on: Wednesday, 02-Jan-2002 10:55:16 MST