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World Magnetic Model 2010

browse graphicDeclination contour map in mercator projection
The World Magnetic Model is the standard model used by the U.S. Department of Defense, the U.K. Ministry of Defence, the North Atlantic Treaty Organization (NATO) and the International Hydrographic Organization (IHO), for navigation, attitude and heading referencing systems using the geomagnetic field. It is also used widely in civilian navigation and heading systems. The model, associated software, and documentation are distributed by NGDC on behalf of the National Geospatial-Intelligence Agency (NGA). The model is produced at 5-year intervals, with the current model expiring on December 31, 2014

Cite as: National Geophysical Data Center, British Geological Survey (2009): World Magnetic Model 2010. National Geophysical Data Center, NOAA. doi:10.7289/V5CR5R8P [access date]

Search and Download
  • WMM2010_Windows.zip (download)
    World Magnetic Model (WMM2010) with the new C software and executables for Windows environment.
  • WMM2010_Linux.tar.zip (download)
    World Magnetic Model (WMM2010) with new C software and executables for Linux environment.
  • WMM2010LegacyFortran.zip (download)
    World Magnetic Model (WMM2010) with Fortran source code and executables for Windows and Linux environments.
  • WMM2010LegacyC.zip (download)
    World Magnetic Model (WMM2010) with C source code and executables for Windows and Linux environments.
  • WMM2010GUI.zip (download)
    World Magnetic Model (WMM2010) with Stand-alone Graphical User Interface (GUI) for Windows and C source code.
Distribution Formats
  • WMM2010_Windows.zip (Version: 1)
  • WMM2010_Linux.tar.zip (Version: 1)
  • WMM2010LegacyFortran.zip (Version: 1)
  • WMM2010LegacyC.zip (Version: 1)
  • WMM2010GUI.zip (Version: 1)
Distributor DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
Point of Contact NGDC Geomagnetic Modeling Team
DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
geomag.models@noaa.gov
Documentation links not available.
Originator
  • NGDC Geomagnetic Modeling Team
    DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
Originator
  • British Geological Survey Geomagnetism Team
    NERC/BGS > British Geological Survey, United Kingdom Natural Environmental Research Council
Publisher
  • DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
  • NERC/BGS > British Geological Survey, United Kingdom Natural Environmental Research Council
Date(s)
  • publication: 2009-12-01
Edition: 3
Data Presentation Form: mapDigital
Dataset Progress Status Complete
Data Update Frequency: As needed
Purpose: The WMM uses spherical harmonic representation to degree and order 12, resolving the magnetic field at 3000 km wavelength. It is primarily intended as a navigation model to provide rapid and reliable orientation in the event of a failure of primary GPS systems and for use in GPS to provide bearing.
Use Limitations
  • Produced by the NOAA National Geophysical Data Center. Not subject to copyright protection within the United States.
Time Period: 2000-01-01  to  2014-12-31
Spatial Reference System: urn:ogc:def:crs:EPSG::4326
Spatial Bounding Box Coordinates:
N: 90
S: -90
E: 180
W: -180
Spatial Coverage Map:
Themes
  • EARTH SCIENCE > Solid Earth > Geomagnetism > Magnetic Field
  • EARTH SCIENCE > Solid Earth > Geomagnetism > Magnetic Intensity
  • EARTH SCIENCE > Solid Earth > Geomagnetism > Magnetic Declination
  • EARTH SCIENCE > Solid Earth > Geomagnetism > Magnetic Inclination
  • EARTH SCIENCE > Solid Earth > Geomagnetism > Reference Fields
Data Centers
  • DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
Places
  • Geographic Region > Global
Use Constraints
  • Cite as: National Geophysical Data Center, British Geological Survey (2009): World Magnetic Model 2010. National Geophysical Data Center, NOAA. doi:10.7289/V5CR5R8P [access date]
Fees
  • None
Source Datasets
  • CHAMP Satellite Data
  • ORSTED Satellite Data
  • INTERMAGNET Observatory Data
Lineage Statement Lineage statement not available.
Processor
  • DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
Processing Steps
  • Measurements during daytime and during periods of strong solar activity are contaminated by external current systems, which are difficult to accurately model. Therefore, only nighttime data during magnetically quiet periods were used in estimating the WMM coefficients.
  • Some contributions to the measured magnetic field, such as the diamagnetic effect of ionospheric plasma (L?hr et al, 2003) or motional induction by tidal ocean currents (Kuvshinov and Olsen, 2005; Maus, 2007), can be accurately modeled and were corrected for prior to the estimation of the WMM main field coefficients.
  • To account for the contributions that have not been removed in the previous steps, an extended set of model parameters is co-estimated with the WMM model coefficients. These account for smaller-wavelength internal magnetic field contributions (spherical harmonic degree larger than 12), second time derivatives (secular acceleration) and contributions from currents external to the Earth. The set of WMM coefficients plus the extended model parameters is called a parent model of the WMM. Two different parent models were produced, reflecting different modeling strategies employed by NGDC for the main field model and BGS for the secular variation model.

Metadata Last Modified: 2014-05-29

For questions about the information on this page, please email: Brian.Meyer@noaa.gov