AA Geomagnetic Activity Indices From Two Antipodal Observatories in Australia and EnglandBack to Collection NOAA/NESDIS/NGDC/STP/Indices
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AA Geomagnetic Activity Indices From Two Antipodal Observatories in Australia and England
browse graphicThe NOAA National Centers for Environmental Information (formerly 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.

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AA index
FTP site for the aa index from 1868 through present day
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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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