Skip to main content
U.S. flag

An official website of the United States government

AA Index

Published by NOAA National Centers for Environmental Information | National Oceanic and Atmospheric Administration, Department of Commerce | Catalog Last Checked: April 12, 2026 at 04:40 AM | Dataset Last Updated: January 01, 1969 at 12:00 AM
The geomagnetic aa index provides a long climatology of global geomagnetic activity using 2 antipodal observatories at Greenwich and Melbourne- IAGA Bulletin 37, 1975 p. 128

Resources

1 resource available

  • Global Change Master Directory (GCMD) Keywords

    TEXT/HTML

Find Related Datasets

data.gov

An official website of the GSA's Technology Transformation Services

Looking for U.S. government information and services?
Visit USA.gov