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Metadata Identifier: gov.noaa.ngdc.mgg.geophysics:G01152

Aggregation Info | Bands | Citations | Constraints | Coverage Descriptions | Dimensions | Extents | Formats | Geographic Bounding Box
Georectified Information | Georeferenceable Information | Identifiers | Instruments | Mediums | OnlineResources | Operations
Platforms | Process Steps | Range Elements | Reference Systems | Responsible Parties | Series | Sources | Spatial Grids | Temporal Extents

MD_DataIdentification

Count Component Title Abstract
1 Data on the Earth's Magnetic Field and its Secular Change since 1800 Information on the past and present orientation of the Earth's magnetic field is available from the National Geophysical Data Center (NGDC) which serves as the national data bank for geomagnetic data. The Earth's magnetic field has been measured by land surveys, ships, aircraft and satellites at hundreds of locations resulting in millions of observations. Many of the observations are of poor quality or are unevenly distributed around the globe. Because of these limiting factors and the variation of the main magnetic field with time, the Earth's field is usually approximated by mathematical models. These models, adjusted to fit selected available observations, have wide application in geophysical and space sciences. Surveyors can obtain data and information for individual specific locations worldwide. Past values of the magnetic field are available from models for areas within the conterminous U.S. from 1750 or from 1945 worldwide. These mathematical models must be periodically updated due to the changing nature of the Earth's magnetic field. NGDC maintains the models and data base of observations to track secular variation of the Earth's magnetic field. Models and software are available on-line. The global geomagnetic observations data bases for secular change studies include high-quality magnetic observations made at observatories worldwide since 1800. Other geomagnetic data bases are: IAGA Repeat Station data base which contains observations from exact reoccupations, Other land Surveys containing miscellaneous land observations worldwide since 1800 including a few thousand observations made at sea by the non-magnetic ships, Carnegie and Zarya, Vector airborne surveys from the Project Magnetic aircraft, satellite and selected marine observations. Most of the surface data are available on-line. At most locations, three magnetic elements were observed: Either declination (D), Inclination (I), and horizontal intensity (H), or declination, horizontal intensity, and vertical intensity (Z), or total intensity (F). Where possible, the values for other magnetic elements, usually the north component (X) and east component (Y), were derived by the computer. The altitude, latitude, and longitude are recorded for each observation. The observatory annual means file contains the results of more of the observatories operating since 1800. Files are revised as new data become available. Searches and plots of data from selected stations can be made. These secular change files are the principal source for tracking the long-period changes in the direction and intensity of the Earth's magnetic field. Other data include a digital bibliography of historical magnetic survey publications at NGDC and the co-located World Data Center-A. Over 750 reports published from the 1830's to 1980's were inventoried in a digital bibliography and digitally imaged in .PCX format. The digital images of these reports have been written to magnetic tape.
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SV_Identification

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CI_Citation

Count Component Title Date Citation Identifier
1 Data on the Earth's Magnetic Field and its Secular Change since 1800
  • 1972-01-01
1 GCMD Data Center Keywords NASA/GCMD Data Center Keywords
    1 GCMD Location Keywords NASA/GCMD Location Keywords
      1 NASA/GCMD Science Keywords NASA/Global Change Master Directory (GCMD) Earth Science Keywords
      • 2007-04
      1 Uncontrolled Keywords
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        CI_Series

        Count Component Name Issue Identification Page
        1 Solid Earth (SE) SE-53, A Report on Geomagnetic Observatories, 1995. SE-51, Bibliography of Historical Geomagnetic Main Field Survey and Secular Variation Reports at the World Data Center-A for Solid Earth Geophysics.
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        CI_ResponsibleParty

        Count Component Individual Organization Position Email Role Linkage
        2 GCMD Valids custodian http://gcmd.nasa.gov/learn/keyword_list.html
        2 Brian Meyer Brian Meyer DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce Brian.Meyer@noaa.gov pointOfContact
        1 User Services (publisher) DOC/NOAA/NESDIS/NGDC - National Geophysical Data Center User Services ngdc.info@noaa.gov publisher
        1 User Services (originator) DOC/NOAA/NESDIS/NGDC - National Geophysical Data Center User Services ngdc.info@noaa.gov originator
        1 DOC/NOAA/NESDIS/NGDC - National Geophysical Data Center Citation URL http://www.ngdc.noaa.gov/geomag/geomag.shtml
        1 User Services DOC/NOAA/NESDIS/NGDC - National Geophysical Data Center User Services ngdc.info@noaa.gov distributor
        2 GCMD User Support Office NASA GCMD User Support Office gcmduso@gcmd.gsfc.nasa.gov custodian http://gcmd.nasa.gov/MailComments/MailComments.jsf?rcpt=gcmduso
        1 NASA/GSFC/SED/ESD/GCDC/GCMD > Global Change Master Directory, Global Change Data Center, Earth Sciences Division, Science and Exploration Directorate, Goddard Space Flight Center, NASA resourceProvider http://gcmd.gsfc.nasa.gov/Resources/valids/archives/keyword_list.html
        1 Susan Mclean Susan McLean DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce Susan.McLean@noaa.gov pointOfContact
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        CI_OnlineResource

        Count Component Linkage Name Description Function
        1 http://gcmd.gsfc.nasa.gov/Resources/valids/archives/keyword_list.html GCMD Keywords, Version 6.0.0.0.0 Thesuarus for earth science keywords and associated directories hosted and maintained by NASA. information
        2 http://gcmd.nasa.gov/MailComments/MailComments.jsf?rcpt=gcmduso GCMD Feedback Form Have a Comment for the GCMD? information
        2 GCMD Keyword Page http://gcmd.nasa.gov/learn/keyword_list.html GCMD Keywords Page This page describes the NASA GCMD Keywords, how to reference those keywords and provides download instructions. information
        1 http://www.ngdc.noaa.gov/geomag/data.shtml Geomagnetic Data On-line Web page where different Geomagnetic data may be downloaded from download
        2 http://www.ngdc.noaa.gov/geomag/geomag.shtml Geomagnetic Data Home page information
        1 http://www.ngdc.noaa.gov/seg/geomag/data.shtml
        1 http://www.ngdc.noaa.gov/seg/potfld/geomag.html
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        MD_Identifier or RS_Identifier

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        EX_Extent

        Bounding Box Temporal Extent
        Count Component Description West East North South Start End
        1 -180.00 180.00 90.00 -90.00 1800-01-01
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        EX_GeographicBoundingBox

        Count Component West East North South
        1 -180.00 180.00 90.00 -90.00
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        EX_TemporalExtent

        Count Component Start End
        1 1800-01-01
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        MD_Format

        Count Component Name Version specification
        1 TIFF
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        MD_Medium

        Count Component Name mediumFormat mediumNote
        1 CARTRIDGE TAPE tar
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        MD_Constraints

        Count Component Use Limitation
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        MD_ReferenceSystem

        none found
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        MD_GridSpatialRepresentation

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        MD_Georeferenceable or MI_Georeferenceable

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        MD_Georectified or MI_Georectified

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        MD_Dimension

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        MD_CoverageDescription or MI_CoverageDescription

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        MD_Band or MI_Band

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        MI_RangeElementDescription

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        MD_AggregateInformation

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        LE_Source or LI_Source

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        LE_ProcessStep or LI_ProcessStep

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        MI_Operation

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        MI_Platform

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        MI_Instrument

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