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Metadata Identifier: gov.noaa.ngdc.stp.solar:G00547

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 Solar Irradiance The "solar constant" is, in fact, not constant. Recent satellite observations have found that the Total Solar Irradiance (TSI), the amount of solar radiation received at the top of the Earth's atmosphere, does vary - see the graph for the results from six satellites(ftp://ftp.ngdc.noaa.gov/STP/SOLAR_DATA/SOLAR_IRRADIANCE/IRRAD97.PDF). "The variations on solar rotational and active region time scales are clearly seen. The large, short-term decreases are caused by the TSI blocking effect of sunspots in magnetically active regions as they rotate through our view from Earth. The peaks of TSI preceding and following these sunpot "dips" are caused by the faculae of solar active regions whose larger areal extent causes them to be seen first as the region rotates onto our side of the sun and last as they rotate over the opposite solar limb." [Excerpted from the UARS descriptive text] The TSI provides the energy that determines the Earth's climate.Variations of the total solar irradiance (solar constant) have become an important new tool for studying the sun since the deployment of a new generation of precise solar flight instrumentation, such as the ACRIM I satellite experiment on the Solar Maximum Mission (SMM) in 1980. The study of variations of the spectral irradiance observed in the EUV also has developed rapidly. The largest variations of the total irradiance occur on time scales of a day to several weeks and are caused by solar active regions. Efforts to model the radiative effects of active regions are proceeding and the first round of results from these have appeared in literature. Disagreements have quickly surfaced in this new field and a topical workshop was convened at the California Institute of Technology in June 1983, to provide both formal and informal opportunities for dialog between those actively working in this area. The papers resulting from this workshop are collected in the report by LaBonte et al. (1984). NGDC Boulder holds the SMM satellite irradiance data for February 1980 to May 1989 and the Nimbus data for November 1978 to the present. Also available are the Hoyt and Eddy model data for the period 1974 to 1981. Early data by Abbott, Smithsonian Institution, from many locations worldwide covering the period 1902 to 1962 are available also.
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SV_Identification

none found
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CI_Citation

Count Component Title Date Citation Identifier
1 NASA/GCMD Data Center Keywords
    1 NASA/GCMD Location Keywords
      1 GCMD Science Keywords NASA/Global Change Master Directory (GCMD) Earth Science Keywords
      • 2007-04
      1 Solar Irradiance
      • 1984
      Downloadable Data
      1 Uncontrolled Keywords
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        CI_Series

        Count Component Name Issue Identification Page
        1 Solar Geophysical Data (SGD) International Standard Serial Numbers (ISSN) 'ISSN 0038-0911 Solar Geophysical Data (SGD)'
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        CI_ResponsibleParty

        Count Component Individual Organization Position Email Role Linkage
        1 DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce (comp.) publisher
        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 SI > Smithsonian Institution originator
        2 Solar Data Manager DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce solar.ngdc@noaa.gov pointOfContact
        1 Solar Data Manager DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce solar.ngdc@noaa.gov distributor
        1 Solar Data Manager DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce solar.ngdc@noaa.gov custodian
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        CI_OnlineResource

        Count Component Linkage Name Description Function
        2 ftp://ftp.ngdc.noaa.gov/STP/SOLAR_DATA/SOLAR_IRRADIANCE
        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://www.ngdc.noaa.gov/stp/SOLAR/ftpsolarirradiance.html
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        MD_Identifier or RS_Identifier

        Count Component Code
        1 Downloadable Data
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        EX_Extent

        Bounding Box Temporal Extent
        Count Component Description West East North South Start End
        1 1978-08-01
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        EX_GeographicBoundingBox

        none found
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        EX_TemporalExtent

        Count Component Start End
        1 1978-08-01
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        MD_Format

        Count Component Name Version specification
        1 ASCII
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        MD_Medium

        none found
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        MD_Constraints

        Count Component Use Limitation
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        MD_ReferenceSystem

        none found
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        MD_GridSpatialRepresentation

        none found
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        MD_Georeferenceable or MI_Georeferenceable

        none found
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        MD_Georectified or MI_Georectified

        none found
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        MD_Dimension

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        MD_CoverageDescription or MI_CoverageDescription

        none found
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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

        none found
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        LE_ProcessStep or LI_ProcessStep

        none found
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        MI_Operation

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        MI_Platform

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        MI_Instrument

        none found
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