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#1 Federal
K Indices of Magnetic Activity Relative to an assumed Quiet-day for each 3-Hour Period
- Organization: National Oceanic and Atmospheric Administration, Department of Commerce
- Dataset Last Updated: January 01, 1957 at 12:00 AM
The NOAA National Centers for Environmental Information (formerly National Geophysical Data Center) receives the K indices on a current basis from approximately 85 observatories. The K index is a...
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Search relevance: 1.00 | Views last month: 2 | Catalog Last Checked: August 02, 2026 at 05:22 PM
#2 Federal
AA Geomagnetic Activity Indices From Two Antipodal Observatories in Australia and England
- Organization: National Oceanic and Atmospheric Administration, Department of Commerce
- Dataset Last Updated: January 01, 1968 at 12:00 AM
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...
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Search relevance: 1.00 | Views last month: 1 | Catalog Last Checked: August 02, 2026 at 05:22 PM

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