National Geophysical Data Center (NGDC), NOAA Satellite and Information Service

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AP Index

Planetary Amplitude index - Bartels 1951. The a-index ranges from 0 to 400 and represents a K-value converted to a linear scale in gammas (nanoTeslas)--a scale that measures equivalent disturbance am- plitude of a station at which K=9 has a lower limit of 400 gammas.

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    Distribution Formats
      Distributor DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
      Documentation links not available.
      Originator
      • NGDC
      Publisher
        Publisher information not available.
      Date(s)
      • publication: unknown
      Dataset Progress Status Under development
      Data Update Frequency: Monthly
      Purpose: Equivalent Amplitude index for 3 hour Kp
      Use Limitations
      • 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.
      Time Period: 1932-01-01  to  2012-01-01
      Spatial Bounding Box Coordinates:
      N: 90.000000
      S: -90.000000
      E: 180.000000
      W: -180.000000
      Spatial Coverage Map:
      Themes
      • Geomagnetism; Space Physics; Climatology, Solid Earth Geophysics
      Use Constraints
      • Use Constraints: None
      Access Constraints
      • Access Constraints: No Constraints
      Fees Fee information not available.
      Lineage Statement Lineage statement not available.

      Metadata Last Modified: 2013-05-24

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