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NOAA > NESDIS > NCEI (formerly NGDC) > Geomagnetism

EMAG2, background image © GFZ Potsdan 1999


What's New?

new MagNet Challenge
new High Def Geomagnetic Model (HDGM2021)
World Magnetic Model 2020 Released
Enhanced Magnetic Model Online Calculator (EMM)
Earth's Magnetic Field: The Force That's Always with You - ESRI Story Map



Models are joint research with:

The Cooperative Institute for Research in Environmental Sciences (CIRES).

Geomagnetism

The study of geomagnetism is one of the oldest of the geophysical sciences. Geomagnetic fields have been observed and used since ancient times. Modern uses of geomagnetic data include navigation and mineral exploration. NCEI develops and distributes models of the geomagnetic field and maintains archives of geomagnetic data to further the understanding of Earth magnetism and the Sun-Earth environment.

Online Calculators

Declination Grid Calculation Magnetic Field US Historic Declination

NOAA has updated the magnetic calculators, including the Enhanced Magnetic Model calculator, an attractive mobile compass app and ESRI location search tool. Calculator URLs have changed, however API scripts do not need to be updated.


Geomagnetic Models & Software

Earth Magnetic Anomaly Model (EMAG2) International Geomagnetic Reference Field (IGRF)
Enhanced Magnetic Model (EMM) Maps and Images (ftp)
High Definition Geomagnetic Model (HDGM) World Magnetic Model (WMM)
Historic Declination Map Viewer


Geomagnetic Data

Airborne Marine Magnetic
Indices Paleomagnetic


Outreach

Earth's Magnetic Field: The Force That's Always with You - ESRI Story Map
Geomagnetism Poster Geomagnetism Brochure
Geomagnetic Services Handout Geomagnetism Impact Handout
WMM Handout CrowdMag



Trackline (marine and airborne) data and derived geomagnetic models and software are managed by NCEI and collocated World Data Center for Geophysics.

map and north arrow
Declination Calculator


World Magnetic Model (WMM) declination
World Magnetic Model


Enhanced Magnetic Model (EMM)
Enhanced Magnetic Model


Earth Magnetic Anomaly Model (EMAG2)
Earth Magnetic Anomaly Model (EMAG2)