NOAA Logo, NOAA Satellites and Information, National Geophysical Data Center (NGDC).

Geomag top navigation banner
Links to related web resources go to NOAA's Space Weather prediction Center Now DoD World Magnetic Model Home Links and descriptions of magnetic field models and software go to the Geomagnetic Data Home go to all data and information Answers to Frequently Asked Questions Go to the Space Physics Interactive Data Resource Geomagnetic Data at NCEI

Surface Geomagnetic Data and Information

Historically, magnetic observatories were established to monitor the secular change of the Earth's magnetic field, and this remains one of their most important functions. This generally involves absolute measurements sufficient in number to monitor instrumental drift and to produce annual means. Over 70 countries operate more than 200 observatories worldwide. The magnetic observatory data are crucial to the studies of secular change, investigations into the Earth's interior, navigation, communication, and to global modeling efforts.

In addition to the continuously operating magnetic observatories, many countries make measurements at temporary magnetic stations over a period of days every 5 - 10 years. Many of the observations are available for download. A listing of repeat station data is available.

Total Magnetic Field for 2000
Based on the IGRF2000
Observatories and IGRF 2000
Magnetic Observatories in Operation
(Click on image to see a larger version.)

Data and information relating to magnetic observatories: