Kp-index and Kpa-index archive (1868 to present)
Kp and Kpa — planetary 3-hourly indices of geomagnetic activity
Data from GFZ Potsdam (Kp-index from 1932-present)
and NOAA NCEI (AA-index converted to Kpa from 1868-1931)
Sunspot numbers from WDC-SILSO, Royal Observatory of Belgium, Brussels
A plot of the current Kp-index is located here:
Using the archive
Just select a date using the pull down menus above the plot. Then hit create plot. You can also directly click on a date in the overview plot below the main diagram.
Linking to images
You are welcome to use these diagrams for non commercial purposes. When you do, please, always provide a link to this website (http://www.theusner.eu/terra/aurora/kp_archive.php).
You can directly link to the current image using this code:
Link to this page showing the current image:
If you want to point people to a certain date in the archive, you can provide a link as follows:
Where YYYY is the year, MM the month, and DD the day (all dates from 1932 to present). N specifies the number of days the diagram covers. Possible values for N are from 3 to 7 days.
Linking to 21 October 1989 would look like this (7 day plot):
All dates and times are UTC.
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