National Geophysical Data Center (NGDC), NOAA Satellite and Information Service

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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.

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    Distribution Formats
      Distributor Distributor information not available
      No point of contact available for this dataset
      Documentation links not available.
      Originator
      • DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
      Originator
      • DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
      Publisher
        Publisher information 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.
      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:
      Themes
      • 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
      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 Statement Lineage statement not available.

      Metadata Last Modified: 2015-09-18

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