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Metadata Identifier: gov.noaa.ngdc.stp.indices:G00584

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 Auroral Electrojet (AE, AL, AO, AU) - A Global Measure of Auroral Zone Magnetic Activity The AE index is derived from geomagnetic variations in the horizontal component observed at selected (10-13) observatories along the auroral zone in the northern hemisphere. To normalize the data a base value for each station is first calculated for each month by averaging all the data from the station on the five international quietest days. This base value is subtracted from each value of one-minute data obtained at the station during that month. Then among the data from all the stations at each given time (UT), the largest and smallest values are selected. The AU and AL indices are respectively defined by the largest and the smallest values so selected. The symbols, AU and AL, derive from the fact that these values form the upper and lower envelopes of the superposed plots of all the data from these stations as functions of UT. The difference, AU minus AL, defines the AE index, and the mean value of the AU and AL, i.e. (AU+AL)/2, defines the AO index. The term "AE indices" is usually used to represent these four indices (AU, AL, AE and AO). The AU and AL indices are intended to express the strongest current intensity of the eastward and westward auroral electrojets, respectively. The AE index represents the overall activity of the electrojets, and the AO index provides a measure of the equivalent zonal current.
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SV_Identification

none found
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CI_Citation

Count Component Title Date Citation Identifier
1 Auroral Electrojet (AE, AL, AO, AU) - A Global Measure of Auroral Zone Magnetic Activity
  • 1976-01-01
1 NASA/GCMD Data Center Keywords
    2 NASA/GCMD Earth Science Keywords
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      CI_Series

      Count Component Name Issue Identification Page
      1 Upper Atmosphere Geophysics International Standard Serial Numbers (ISSN) 'ISSN 0579-7144 UAG Upper Atmosphere Geophysics'
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      CI_ResponsibleParty

      Count Component Individual Organization Position Email Role Linkage
      2 Citation URL http://swdcwww.kugi.kyoto-u.ac.jp/aedir/index.html
      3 Justin Mabie Justin Mabie DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce Space and Terrestrial Weather Specialist Justin.Mabie@noaa.gov pointOfContact
      1 Justin Mabie DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce Justin.Mabie@noaa.gov distributor
      1 User Services DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce ngdc.info@noaa.gov publisher
      2 User Services DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce ngdc.info@noaa.gov originator
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      CI_OnlineResource

      Count Component Linkage Name Description Function
      2 ftp://ftp.ngdc.noaa.gov/STP/GEOMAGNETIC_DATA/INDICES/AURORAL_ELECTROJET Geomagnetic Data/Indices/Auroral Electroject ftp site download
      3 http://swdcwww.kugi.kyoto-u.ac.jp/aedir/index.html WDC-C2 KYOTO AE index service Home page for the World Data Center for Geomagnetism with links to the data information
      1 http://www.ngdc.noaa.gov/geomag Auroral Electrojet Index (AE) Home page information
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      MD_Identifier or RS_Identifier

      none found
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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 1957-01-01
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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 1957-01-01
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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
      1 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.
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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

      none found
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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

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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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