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

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Worldwide Magnetograms with Geomagnetic Components D, H, Z, or X, Y, and Z

The National Geophysical Data Center receives magnetograms from over 200 geomagnetic observatories. The Center archives data from 1867 to the present, however the primary holdings are from 1957 to the present. The archives contain over 5,000 reels of 35 mm microfilm copies of magnetograms. Magnetograms are records obtained from an instrument known as a magnetometer which is designed to measure small variations in the components of the geomagnetic field. There are two types of magnetometers, the La Cour and the Ruska. The magnetogram consists of one or more (usually 3) variometers, one for each element usually D, H, Z (less common X, Y, Z) and a recorder. The standard magnetogram usually has all three components recorded simultaneously on one sheet of paper. In addition to the 3 traces, reference lines (baselines) are recorded. The baselines are used in absolute calibration of the magnetogram. The normal recording speed is 20 mm/hour with the drum turning once in 24 hours.

Cite this dataset when used as a source.

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    Distribution Formats
      Distributor DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
      Point of Contact Justin Mabie
      DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
      303 497-6135
      justin.mabie@noaa.gov
      Documentation links not available.
      Originator
      • User Services
        DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
      Publisher
      • DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
      Date(s)
      • publication: 1957-01-01
      Edition: First
      Dataset Progress Status Under development
      Data Update Frequency: Weekly
      Purpose: Geomagnetic Research
      Use Limitations
      • While every effort has been made to ensure that these data are accurate and reliable within the limits of the current state of the art, NOAA cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty.
      Time Period: 1957-01-01  to  Present
      Spatial Bounding Box Coordinates:
      N: 90.000000
      S: -90.000000
      E: 180.000000
      W: -180.000000
      Spatial Coverage Map:
      Themes
      • EARTH SCIENCE > Solid Earth > Geomagnetism > Geomagnetic Indices
      • EARTH SCIENCE > SOLID EARTH > Geomagnetism > Magnetic Declination
      • EARTH SCIENCE > SOLID EARTH > Geomagnetism > Magnetic Intensity
      • EARTH SCIENCE > Solid Earth > Geomagnetism > Magnetic Field
      • D, H, Z Components
      • Earth Interior & Crust
      • WDC/STP, BOULDER > World Data Center for Solar-Terrestrial Physics, Boulder
      • DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
      Places
      • Global
      Use Constraints
      • Use Constraints: None
      Access Constraints
      • Access Constraints: No Constraints
      Fees
      • Contact Data Center
      Lineage Statement Lineage statement not available.
      Processing Steps
      • Mission Start Date

      Metadata Last Modified: 2013-05-28

      For questions about the information on this page, please email: Justin.Mabie@noaa.gov