World Magnetic Model 2015
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title: World Magnetic Model 2015
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date: 2014-12-15
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Anchor: DOI doi:10.7289/V5TH8JNW
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individualName: Chulliat, A.
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abstract: 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 is produced at 5-year intervals, with the current model expiring on December 31, 2019. The current model WMM2015 is produced jointly by the NGDC and the British Geological Survey (BGS). The model, associated software, and documentation are distributed by NGDC on behalf of US National Geospatial-Intelligence Agency and by BGS on behalf of UK Defence Geographic Centre.
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keyword: Earth Science > Solid Earth > Geomagnetism > Magnetic Field
keyword: Earth Science > Solid Earth > Geomagnetism > Magnetic Intensity
keyword: Earth Science > Solid Earth > Geomagnetism > Magnetic Declination
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keyword: DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
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otherConstraints: Distribution liability: NOAA and NCEI make no warranty, expressed or implied, regarding these data, nor does the fact of distribution constitute such a warranty. NOAA and NCEI cannot assume liability for any damages caused by any errors or omissions in these data. If appropriate, NCEI can only certify that the data it distributes are an authentic copy of the records that were accepted for inclusion in the NCEI archives.
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otherConstraints: Use liability: NOAA and NCEI cannot provide any warranty as to the accuracy, reliability, or completeness of furnished data. Users assume responsibility to determine the usability of these data. The user is responsible for the results of any application of this data for other than its intended purpose.
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otherConstraints: Cite as: Chulliat, A.; S. Macmillan; P. Alken; C. Beggan; M. Nair; B. Hamilton; A. Woods; V. Ridley; S. Maus; A. Thomson. 2014: World Magnetic Model 2015. NOAA National Centers for Environmental Information. https://doi.org/10.7289/V5TH8JNW. Accessed [date].
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beginPosition: 2015-01-01
endPosition: 2019-12-31
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fees: WMM2015 and associated softwares are all free and publically available.
orderingInstructions: Contact NCEI for other distribution options and instructions.
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name: WMM2015_Windows.zip
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specification: World Magnetic Model (WMM2015) with the new C software and executables for Windows environment.
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specification: World Magnetic Model (WMM2015) with new C software and executables for Linux environment.
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specification: World Magnetic Model (WMM2015) with Fortran source code and executables for Windows and Linux environments.
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specification: World Magnetic Model (WMM2015) with C source code and executables for Windows and Linux environments.
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specification: World Magnetic Model (WMM2015) with Stand-alone Graphical User Interface (GUI) for Windows and C source code.
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name: The US/UK World Magnetic Model for 2015-2020: Technical Report
description: PDF file containing information about the development and source data for the World Magnetic Model 2015-2020
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description: NOAA created the National Centers for Environmental Information (NCEI) by merging NOAA's National Climatic Data Center (NCDC), National Geophysical Data Center (NGDC), and National Oceanographic Data Center (NODC), including the National Coastal Data Development Center (NCDDC), per the Consolidated and Further Continuing Appropriations Act, 2015, Public Law 113-235. NCEI launched publicly on April 22, 2015.
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DateTime: 2015-04-22T00:00:00
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description: 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 generating the WMM coefficients.
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description: Some contributions to the measured magnetic field, such as the diamagnetic effect of ionospheric plasma (Lühr 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 generation of the WMM main field coefficients.
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description: 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.
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