AA Geomagnetic Activity Indices From Two Antipodal Observatories in Australia and EnglandView Metadata As: Get Data, FAQ, HTML, 19139 XML
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AA Geomagnetic Activity Indices From Two Antipodal Observatories in Australia and England
browse graphicThe 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
ftp://ftp.ngdc.noaa.gov/STP/GEOMAGNETIC_DATA/AASTAR/
ASCII
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Justin Mabie
DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
303 497-6135
8:00 - 5:00 Mountain
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Free

Depends on the Data Set

Ordering Instructions
Ordering Instructions: Price information is available upon request. Prepay by check, money order or bank card There is a standard handling charge, with additional costs for special handling. Orders may be placed via fax, email, regular mail or telephone Custom Order Process: Contact data center for information

Use Limitation
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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