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Record Search Query: ServiceParameters>MODELS>SOLAR-ATMOSPHERE/SPACE-WEATHER MODELS

World Magnetic Model
Entry ID: WMM
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Summary
Abstract: The World Magnetic Model is the standard model of the US Department of Defense,
the UK Ministry of Defence, the North Atlantic Treaty Organization (NATO), and
the World Hydrographic Office (WHO) navigation and attitude/heading referencing
systems. It is also used widely in civilian navigation systems. The model,
associated software, and documentation are distributed by NGDC on behalf of
NGA. The model is produced at 5-year intervals, with the current model expiring
on December 31, 2009.
http://www.ngdc.noaa.gov/seg/WMM/DoDWMM.shtml

The WMM consists of a degree and order 12 spherical-harmonic main (i.e.,
core-generated) field model comprised of 168 spherical-harmonic Gauss
coefficients and degree and order 12 spherical-harmonic Secular-Variation (SV)
(core-generated, slow temporal variation) field model (determined to degree and
order 8). WMM2005 supersedes WMM2000 and should replace this model in
navigation systems. Also included with the model is computer software
(available in FORTRAN or C) for computing the magnetic field components X, Y,
Z, F, D, I, and H in geodetic coordinates. The spherical-harmonic expansions
used to compute the magnetic field components are described in the NOAA
Technical Report: The US/UK World Magnetic Model for 2005-2010

The World Magnetic Model is a product of the United States National
Geospatial-Intelligence Agency (NGA). The U.S. National Geophysical Data Center
(NGDC) and the British Geological Survey (BGS) produced the WMM with funding
provided by NGA in the USA and by the Defence Geographic Imagery and
Intelligence Agency (DGIA) in the UK.

Related URL
Link: GET SERVICE > GET SOFTWARE PACKAGE
Description: DoD software and WMM model is available for download in either C or Fortran.

Link: VIEW RELATED INFORMATION
Description: World Magnetic Model documentation.
Service Citation
Originators: NGA, NGDC, BGS
Title: World Magnetic Model
Release_Date: December 2004
Provider: NGDC, NOAA
Edition: WMM-2005
URL: http://www.ngdc.noaa.gov/seg/WMM/DoDWMM.shtml
ISO Topic Category
GEOSCIENTIFIC INFORMATION
Access Constraints
This site provides access to the DoD software and current WMM model. 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 in 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.

http://www.ngdc.noaa.gov/seg/WMM/soft.shtml
Service Provider
National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce

Service Provider Personnel
Name: SUSAN MCLEAN
Phone: (303) 497-6478
Fax: (303) 497-6513
Email: Susan.McLean at noaa.gov
Contact Address:
NOAA/NESDIS/NGDC
E/GC2 325 Broadway
City: Boulder
Province or State: CO
Postal Code: 80305-3328
Country: USA
Distribution Media
Distribution_Media: online
Fees: none
Personnel
TYLER B. STEVENS
Role: SERF AUTHOR
Phone: (301) 614-6898
Fax: 301-614-5268
Email: Tyler.B.Stevens at nasa.gov
Contact Address:
NASA Goddard Space Flight Center
Global Change Master Directory
City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA

SUSAN MACMILLAN
Role: TECHNICAL CONTACT
Phone: +44 (0)131 667 1000
Fax: +44 (0)131 668 2683
Email: smac at bgs.ac.uk
Contact Address:
British Geological Survey,
Geophysics & Marine Geoscience
Murchison House,
West Mains Road,
Edinburgh EH9 3LA.
Country: UNITED KINGDOM
Publications/References
NOAA Technical Report: The US/UK World Magnetic Model for 2005-2010
http://www.ngdc.noaa.gov/seg/WMM/data/TRWMM_2005.pdf
Creation and Review Dates
SERF Creation Date: 2004-04-27
SERF Last Revision Date: 2007-04-19
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