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Updated model coefficients are released at 5-year intervals, with WMM2015 (released Dec 15, 2014) supposed to last until December 31, 2019. 2. Compass needles point in the direction of the magnetic field lines, which is generally different from the direction to the Geographic North Pole. 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. Project details.

1. This visualization uses a transverse aspect of the Plate Carée projection to minimize distortion near the poles. https://doi.org/10.25921/xhr3-0t19. These models provide current and past values of the geomagnetic field on regional and global spatial scales. Users assume responsibility to determine the usability of these data. However, due to extraordinarily large and erratic movements of the north magnetic pole, an out-of-cycle update (WMM2015v2) was released in February 2019[3] (delayed by a few weeks due to the U.S. federal government shutdown)[4] to accurately model the magnetic field above 55° north latitude until the end of 2019. Magnetic variation/declination ----- Calculates magnetic variation/declination for any latitude/longitude/altitude, for any date. (2000), while the field from 1900 to 2015 is given by the 11th generation of the International Geomagnetic Reference Field. doi: 10.25921/xhr3-0t19 [access date]. Cite as: Chulliat, A., W. Brown, P. Alken, S. Macmillan, M. Nair, C. Beggan, A.

Complete - production of the data has been completed. WMM is the standard geomagnetic model of the United States Department of Defense (DoD), the Ministry of Defence (United Kingdom), the North Atlantic Treaty Organization (NATO), and the World Hydrographic Office (WHO) navigation and attitude/heading reference. Woods, B. Hamilton, B. Meyer and R. Redmon, 2019, Out-of-Cycle Update of the US/UK World Magnetic Model for 2015-2020: Technical Note, National Centers for Environmental Information, NOAA. Science On a Sphere® P; Alken; S. Macmillan; M. Nair; C. Beggan; A. Uses the NOAA National Geophysical Data Center, epoch 2015 data. The set of WMM coefficients plus the extended model parameters is called a parent model of the WMM. These calculators are popular among scientists, engineers and the general public across the world as a resource to compute geomagnetic field elements. The World Magnetic Model (WMM) is a large spatial-scale representation of the Earth's magnetic field.

For questions about the information on this page, please email: NOAA National Centers for Environmental Information, Global Change Master Directory (GCMD) Science Keywords, Global Change Master Directory (GCMD) Data Center Keywords, Global Change Master Directory (GCMD) Location Keywords, Out-of-Cycle Update of the US/UK World Magnetic Model for 2015-2020: Technical Note. NOAA and NCEI cannot assume liability for any damages caused by any errors or omissions in these data. File Specification: World Magnetic Model (WMM2015v2) with new C software and executables for Linux environment. Project links. 2015-04-22T00:00:00 - 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.
The Earth creates its own magnetic field from the electric currents created in the liquid iron-nickel core. 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. Magnetic-Declination QGIS plugin begin : 2015-04-08 copyright : (C) 2015 by Aldo Scorza email : hacked dot crew at gmail dot com

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 WMM is produced by the U.S. National Geophysical Data Center (NGDC) in collaboration with the British Geological Survey (BGS). This dataset shows lines of equal magnetic declination (isogonic lines) measured in degrees east (positive) or west (negative) of True North. The next regular update (WMM2020) occurred in December 2019. File Specification: World Magnetic Model (WMM2015v2) coefficient file with test values and instructions. Accessed [date].
National Oceanic and Atmospheric Administration. In this figure and animation, the magnetic field from 1590 to 1890 is given by the GUFM-1 model of Jackson et al. Distribution liability: NOAA and NCEI make no warranty, expressed or implied, regarding these data, nor does the fact of distribution constitute such a warranty.

Figure the magnetic declination -- the angle between magnetic south and true south ... using an online calculator such as the one available from the National Geophysical Data Center. The model is produced at 5-year intervals, with the current model expiring on December 31, 2019. Produced by the NOAA National Centers for Environmental Information. 2015-04-22T00:00:00 - 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.

2019: World Magnetic Model 2015 version 2. Use liability: NOAA and NCEI cannot provide any warranty as to the accuracy, reliability, or completeness of furnished data.

NCEI launched publicly on April 22, 2015. Establishing True North: If you live East of the 0 degree line, True North will be east of the compass needle by the number of degrees shown on the map for your location.For example, if you live in Miami, your true north will be 6 degrees east of magnetic north. For example, WMM is pre-installed in Android and iOS devices to correct for the magnetic declination.

File Specification: World Magnetic Model (WMM2015v2) with Stand-alone Graphical User Interface (GUI) for Windows and C source code. The user is responsible for the results of any application of this data for other than its intended purpose. The green line is where the declination equals zero and the direction of True North and Magnetic North are equal (agonic line).

Since the 1970's, the movement of the Magnetic North Pole has accelerated, which is noticeable in this dataset. The Magnetic North and South Poles are indicated by the green circles. The Geographic North Pole is defined by the latitude 90° N and is the axis of the Earth's rotation. It is also used widely in civilian navigation and heading systems. Find your approximate location on the declination map above. Measurements during daytime and during periods of strong solar activity are contaminated by external current systems, which are difficult to accurately model. NOAA’s National Geophysical Data Center at Boulder provides online calculators for geomagnetic field models. NOAA National Centers for Environmental Information. 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. 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. The World Magnetic Model (WMM) is a large spatial-scale representation of the Earth's magnetic field.It was developed jointly by the US National Geophysical Data Center and the British Geological Survey.The data and updates are issued by the US National Geospatial Intelligence Agency and the UK Defence Geographic Centre.. WMM2015 and associated softwares are all free and publically available. It is important to know the magnetic declination when using a compass to navigate so that the direction of True North can be determined. File Specification: World Magnetic Model (WMM2015v2) with Fortran source code and executables for Windows and Linux environments. Woods; B. Hamilton; B. Meyer; R. Redmon. The current model WMM2015v2 is produced jointly by the NGDC and the British Geological Survey (BGS). The Magnetic North and South Poles are indicated by the green circles.

File Specification: World Magnetic Model (WMM2015v2) with C source code and executables for Windows and Linux environments. NCEI Metadata ID: gov.noaa.ngdc:WMM2015v2.

Therefore, only nighttime data during magnetically quiet periods were used in generating the WMM coefficients. The Magnetic North Pole is where the Earth's magnetic field points vertically downward. The model consists of a degree and order 12 spherical harmonic expansion of the magnetic scalar potential of the geomagnetic main field generated in the Earth's core. National Oceanic and Atmospheric Administration, The magnetic poles (indicated by green circles) slowly move with time, The magnetic declination varies with time due to changes of the Earth's magnetic field, Since the 1970's the Magnetic North Pole has accelerated from less than 10 to more than 30 miles per year. It was developed jointly by the US National Geophysical Data Center and the British Geological Survey. However, the magnetic North and South Pole are not aligned with the Geographic North and South Pole. File Specification: World Magnetic Model (WMM2015v2) with the new C software and executables for Windows environment.

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