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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 Global Change Master Directory (GCMD) Data Center Keywords
    2017-04-24
1 GCMD Location Keywords Global Change Master Directory (GCMD) Location Keywords
    2017-04-24
1 GCMD Project Keywords Global Change Master Directory (GCMD) Project Keywords
    2017-04-24
1 NASA/GCMD Science Keywords Global Change Master Directory (GCMD) Science Keywords
    2017-04-24
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
    5 https://www.ngdc.noaa.gov/geomag/geomag.shtml
    1 Anna Milan Anna Milan DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce Metadata Specialist Anna.Milan@noaa.gov pointOfContact
    3 Brian Meyer Brian Meyer DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce Brian.Meyer@noaa.gov pointOfContact
    2 NCEI (publisher) DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce publisher
    1 User Services (originator) DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce User Services ngdc.info@noaa.gov originator
    1 User Services DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce User Services ngdc.info@noaa.gov distributor
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    CI_OnlineResource

    Count Component Linkage Name Description Function
    4 https://earthdata.nasa.gov/about/gcmd/global-change-master-directory-gcmd-keywords Global Change Master Directory (GCMD) Keywords The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords. information
    1 https://www.ngdc.noaa.gov/geomag/data.shtml Geomagnetic Data On-line Web page where different Geomagnetic data may be downloaded from download
    2 https://www.ngdc.noaa.gov/geomag/geomag.shtml Geomagnetic Data Home page information
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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

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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

    Count Component DateTime Description
    1 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.
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    MI_Operation

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    MI_Platform

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    MI_Instrument

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