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Background

Brief description of geomagnetism

About WMM

Main field model development, accuracy and limitations

Model & Software

Main field, model development, accuracy and test values

Online Calculators

Web-calulators for main field

Maps

Browse imagery and contour maps for main field and secular change

Uses of WMM

Common applications of WMM

License

License and copyright information

The World Magnetic Model and Associated Software

This site provides access to the DoD software and current WMM model and WMM online calculator. The software computes the main components of the geomagnetic field and their annual changes. The programs are designed to be used in demand mode. The software is available as both C and Fortran source code. The model file, WMM.COF, is expected to reside in the same directory as the software. Note: The altitude is referenced to the World Geodetic System 1984 (WGS 84) ellipsoid. The new WMM software library provides functions to convert height above mean sea level (AMSL) to height above WGS 84. This option is enabled by default.

Input And Output

The input parameters and valid entries are:

Latitude -90.00 to +90.00 degrees
Longitude -180.00 to +180.00 degrees
Altitude referenced to the WGS 84 ellipsoid OR the Mean Sea Level (MSL) (downloadable software)
Date 2010.0 to 2015.0

The seven magnetic components computed are:

F - Total Intensity of the geomagnetic field
H - Horizontal Intensity of the geomagnetic field
X - North Component of the geomagnetic field
Y - East Component of the geomagnetic field
Z - Vertical Component of the geomagnetic field
I (DIP) - Geomagnetic Inclination
D (DEC) - Geomagnetic Declination (Magnetic Variation)

Annual change in each of these magnetic components is also displayed. The annual change is computed by subtracting the main field values for the desired input date from main field values one year later. The output units are displayed using the abbreviations nT (nanoTesla), deg (degrees) and min (minutes) per year.

Third party software for World Magnetic Model

    Third party software is available here. Note: Neither the authors nor NGDC can provide any warranty or technical support for these programs.

Changes made to the WMM Code

As changes are made to the WMM code, the revised code will be posted. Check this site for change notices. The downloadable code is always the latest version.

Download the World Magnetic Model - WMM2010 - software and documentation.

WMM2010 coefficient file

~ Size

Release Date

Description

WMM2010COF.zip

2KB

Dec 15, 2009

WMM2010 Coefficient file (WMM.COF) valid for 2010 - 2015.

WMM2010 + 2010 Software

WMM2010_Windows.zip

12.4MB

Apr 26, 2012

World Magnetic Model (WMM2010) with the new C software and executables for Windows environment.

WMM2010_Linux.tar.gz

3.3MB

Apr 26, 2012

World Magnetic Model (WMM2010) with new C software and executables for Linux environment.

WMM2010 + Windows GUI

WMM2010GUI.zip

8.2MB

Feb 22, 2010

World Magnetic Model (WMM2010) with Stand-alone Graphical User Interface (GUI) for Windows and C source code.

WMM2010 Documentation

WMM2010_Report.pdf

22MB

Jan 22, 2010

World Magnetic Model (WMM2010) - Technical Report. Note: Older versions of the WMM reports are available here

WMM2010testvalues.pdf

35KB

Dec 15, 2009

World Magnetic Model (WMM2010) - Test values.

WMM2010 + Old Software

WMM2010LegacyFortran.zip

1MB

Dec 15, 2009

World Magnetic Model (WMM2010) with Fortran source code and executables for Windows and Linux environments.

WMM2010LegacyC.zip

180KB

Feb 4, 2010

World Magnetic Model (WMM2010) with C source code and executables for Windows and Linux environments.

WMM 2010 metadata

83.7KB

May 16, 2013

World Magnetic Model (WMM2010) metadata in xml format.


Last Modified on: Tuesday, 18-Jun-2013 11:18:20 MDT
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