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AA Geomagnetic Activity Indices From Two Antipodal Observatories in Australia and England

browse graphicAnnual Sunspot and aa Numbers
The National Geophysical Data Center receives, on a monthly basis, indices that are based on the data from two approximately antipodal observatories in England and Australia. The AA-indices are available from 1868 to present.

Cite this dataset when used as a source.

Search and Download
  • AA index (download)
    FTP site for the aa index from 1868 through present day
Distribution Formats
  • ASCII
Distributor DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
Point of Contact Justin Mabie
DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
303 497-6135
Justin.Mabie@noaa.gov
Documentation links not available.
Originator
  • User Services
    DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
Publisher
  • DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
Date(s)
  • publication: 1968-01-01
Edition: First
Dataset Progress Status Complete
Data Update Frequency:
Purpose: Geomagnetic Activity Research
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: 1868-01-01  to  Present
Spatial Bounding Box Coordinates:
N: 90.000000
S: -90.000000
E: 180.000000
W: -180.000000
Spatial Coverage Map:
Themes
  • Earth Science > Land
  • EARTH SCIENCE > SOLID EARTH > Geomagnetism > Geomagnetic Indices
  • Earth Science > Interior & Crust
  • Geomagnetism
Places
  • Global
Use Constraints
  • Use Constraints: None
Access Constraints
  • Access Constraints: No Constraints
Fees
  • Free Depends on the Data Set
Lineage Statement Lineage statement not available.

Metadata Last Modified: 2013-05-24

For questions about the information on this page, please email: Justin.Mabie@noaa.gov