• 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.

    Data and Resources

    Metadata Source

    Harvested from NGDC - STP - Geomag - iso

    About this Dataset

    Resource Type Dataset
    Metadata Date May 28, 2013
    Metadata Created Date Aug 20, 2013
    Metadata Updated Date May 29, 2014
    Reference Date(s) Jan 01, 1957 (publication)
    Responsible Party DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce (Point of Contact)
    Contact Email
    Access Constraints ["Use Constraints: None", "Access Constraints: No Constraints"]
    Bbox East Long 180.000000
    Bbox North Lat 90.000000
    Bbox South Lat -90.000000
    Bbox West Long -180.000000
    Coupled Resource
    Frequency Of Update weekly
    Guid gov.noaa.ngdc.stp.geomag:G00583
    Harvest Object Id 102be0b7-1231-4604-9ed9-9d873f99b6d2
    Harvest Source Id 21ab3ced-499d-4f59-bb62-448fe06ef827
    Harvest Source Title NGDC - STP - Geomag - iso
    Licence ["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."]
    Metadata Language
    Metadata Type geospatial
    Spatial {"type": "Polygon", "coordinates": [[[-180.0, -90.0], [180.0, -90.0], [180.0, 90.0], [-180.0, 90.0], [-180.0, -90.0]]]}
    Spatial Data Service Type
    Spatial Reference System
    Spatial Harvester True
    Temporal Extent Begin 1957-01-01

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