NCEI (formerly NGDC)
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Geomagnetic Observatory Annual Means Data

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.
Cite this dataset when used as a source.
Online Access
  • Online access is not available for this resource
Distribution Formats Format not available
    Distributor Distributor information not available
    Dataset Point of Contact Justin Mabie
    Space and Terrestrial Weather Specialist
    DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
    (303) 497-6135
    Justin.Mabie@noaa.gov
    Documentation links not available.
    Date(s)
    • publication: 2006-01-01
    Dataset Progress Status Under development
    Data Update Frequency: Annually
    Supplemental Information:
    NCEI(NGDC) / WDC, Boulder compiles this global database with the cooperation and collaboration of geomagnetic observing organizations worldwide. Please recognize the specific data providers as shown in the station metadata when using this data.
    Purpose: To further the understanding of Earth magnetism and the Sun-Earth environment and to monitor the secular change (variation), of the Earth's magnetic field.
    Originator(s)
    • DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
    • DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
    Publisher(s)
    • DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
    Time Period: 1813-01-01 to Present
    Spatial Bounding Box Coordinates:
    N: 89.0
    S: -89.0
    E: 180.0
    W: -180.0
    Spatial Coverage Map:
    Theme keywords
    • Earth Science > Solid Earth > Geomagnetism
    • Earth Science > Solid Earth > Geomagnetism > Magnetic Declination
    • Earth Science > Solid Earth > Geomagnetism > Magnetic Field
    • Earth Science > Solid Earth > Geomagnetism > Magnetic Field
    • Earth Science > Solid Earth > Geomagnetism > Magnetic Inclination
    • Earth Science > Solid Earth > Geomagnetism > Magnetic Intensity
    • Earth Science > Solid Earth > Geomagnetism > Reference Fields
    • Earth Science > Sun-Earth Interactions > Solar Activity
    Data Center keywords
    • DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
    • DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
    Use Constraints
    • Use Constraints: Please site the providers of the data when using these data.
    Access Constraints
    • Access Constraints: This data is in the public domain and freely accessible.
    Fees Fee information not available.
    Lineage information for: repository
    Processing Steps
    • 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. NCEI launched publicly on April 22, 2015.
    Acquisition Information (collection)
    Operation
    • G10118
    Last Modified: 2015-09-18
    For questions about the information on this page, please email: Justin.Mabie@noaa.gov