SWPC/GEOMAG/AIN7DAYFILE
From ViRBO
See also SWPC#A and K Indices.
A index
- Updated hourly
- Data are derived from ftp://ftp.swpc.noaa.gov/pub/lists/geomag/7day_AK.txt file. This data set is updated hourly. Click this link if the date in the drop-down menu below appears outdated; you may also need to clear your browser's cache.