Geomagnetic Observatory Annual Means Data
type: Dataset
description: The NOAA National Centers for Environmental Information (formerly National Geophysical Data Center) / World Data Center, Boulder maintains an active database of worldwide geomagnetic observatory data. Historically, magnetic observatories were established to monitor the secular change (variation), 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. While the current global network of geomagnetic observatories involves over 70 countries operating more than 200 observatories, the historic database includes observations from more than 600 observatories since the early 1800s. 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. The Earth's magnetic field is described by seven parameters. These are declination (D), inclination (I), horizontal intensity (H), vertical intensity (Z), total intensity (F) and the north (X) and east (Y) components of the horizontal intensity. By convention, declination is considered positive when measured east of north, inclination and vertical intensity positive down, X positive north, and Y positive east. The magnetic field observed on Earth is constantly changing.
issued: 2025-11-20T08:30:46.132095
modified: 2025-11-20T08:30:46.132100
spatial: Location
keyword: amerigeo
keyword: amerigeoss
keyword: ckan
keyword: earth-science
keyword: geo
keyword: geomagnetism
keyword: geoss
keyword: magnetic-declination
keyword: magnetic-field
keyword: magnetic-inclination
keyword: magnetic-intensity
keyword: national
keyword: north-america
keyword: reference-fields
keyword: solar-activity
keyword: solid-earth
keyword: sun-earth-interactions
keyword: united-states

US Migrating
type: Agent