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

Data provided by  National Oceanic and Atmospheric Administration

The 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.

About this Dataset

Updated: 2024-02-22
Metadata Last Updated: 2025-11-19T15:45:18.539Z
Date Created: N/A
Data Provided by:
Dataset Owner: N/A

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Title AA Geomagnetic Activity Indices From Two Antipodal Observatories in Australia and England
Description The 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.
Modified 2025-11-19T15:45:18.539Z
Publisher Name N/A
Contact N/A
Keywords Earth Science > Land , EARTH SCIENCE > SOLID EARTH > Geomagnetism > Geomagnetic Indices , Earth Science > Interior & Crust , Geomagnetism , Global , DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce , DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce , geoscientificInformation 
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