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World Magnetic Model
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<h2 id="enhanced-magnetic-model-emm">Enhanced Magnetic Model (EMM)</h2> <p>The Enhanced Magnetic Model (EMM) is a sister product of the NGDC featuring a much higher amount of data to degree and order 790, giving a wavelength of 51 km as opposed to the 3000 km of WMM. At this resolution, it is not only able to model the <a href="/facts/Earth%2527s_magnetic_field/73G36wmx">Earth's magnetic field</a> at the core-mantle boundary ("main field"), but also take into account <a href="/facts/Magnetic_anomalies/a9K42q7Q">magnetic anomalies</a> caused by the minerals in the Earth's crust.<a class="footnote-ref" id="fnref:7" href="#fn:7"><sup>7</sup></a> </p> <h2 id="see-also">See also</h2> <ul><li><a href="/facts/International_Geomagnetic_Reference_Field/vRcU32t7">International Geomagnetic Reference Field</a>: another model, of similar quality, which models past years as well</li> <li><a href="/facts/Runway_numbering/EYy72SPJ">Runway numbering</a></li></ul> <h2 id="external-links">External links</h2> <ul><li><a href="https://www.ncei.noaa.gov/products/world-magnetic-model">WMM model and software can be downloaded from the National Geophysical Data Center's WMM page</a></li> <li><a href="https://developer.android.com/reference/android/hardware/GeomagneticField.html">World Magnetic Model method in the Android operating system</a></li> <li><a href="http://www.noaanews.noaa.gov/stories2014/20141215_worldmagneticmodel.html">World Magnetic Model 2015 NOAA press release </a></li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>David Bartlett, Essentials of Positioning and Location Technology, p. 110, Cambridge University Press, 2013 ISBN 1107354803. <a href="/wiki/ISBN_(identifier)" target="_blank">/wiki/ISBN_(identifier)</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>Chulliat, Arnaud; et al. "The US/UK World Magnetic Model for 2015-2020" (PDF). ngdc.noaa.gov. NOAA. <a href="https://www.ngdc.noaa.gov/geomag/WMM/data/WMMReports/WMM2015_Report.pdf" target="_blank">https://www.ngdc.noaa.gov/geomag/WMM/data/WMMReports/WMM2015_Report.pdf</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>"Airport Runway Names Shift with Magnetic Field". National Centers for Environmental Information (NCEI). 16 November 2017. <a href="https://www.ncei.noaa.gov/news/airport-runway-names-shift-magnetic-field" target="_blank">https://www.ncei.noaa.gov/news/airport-runway-names-shift-magnetic-field</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> <li id="fn:4"><p>"The World Magnetic Model and Associated Software". National Centers for Environmental Information. 4 February 2019. Retrieved 6 February 2019. <a href="https://www.ncei.noaa.gov/products/world-magnetic-model" target="_blank">https://www.ncei.noaa.gov/products/world-magnetic-model</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li> <li id="fn:5"><p>Witze, Alexandra (January 9, 2019). "Earth's magnetic field is acting up and geologists don't know why". Nature. 565 (7738): 143–144. Bibcode:2019Natur.565..143W. doi:10.1038/d41586-019-00007-1. PMID 30626958. <a href="https://doi.org/10.1038%2Fd41586-019-00007-1" target="_blank">https://doi.org/10.1038%2Fd41586-019-00007-1</a> <a href="#fnref:5" class="footnote-back-ref">↩</a></p></li> <li id="fn:6"><p>"World Magnetic Model | NCEI". <a href="https://www.ncei.noaa.gov/products/world-magnetic-model" target="_blank">https://www.ncei.noaa.gov/products/world-magnetic-model</a> <a href="#fnref:6" class="footnote-back-ref">↩</a></p></li> <li id="fn:7"><p>National Centers for Environmental Information (NCEI). "Enhanced Magnetic Model (EMM)". www.ngdc.noaa.gov. <a href="https://www.ncei.noaa.gov/products/enhanced-magnetic-model" target="_blank">https://www.ncei.noaa.gov/products/enhanced-magnetic-model</a> <a href="#fnref:7" class="footnote-back-ref">↩</a></p></li> </ol>