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

The images you create are deleted at regular intervals. So you cannot directly link to an image from your homepage. You are allowed to copy an image to your homepage and use it there if you also provide a link to this website (http://www.theusner.eu/terra/aurora/kp_archive.php).

If you want to point people to a certain date in the archive, you can provide a link as follows:

http://www.theusner.eu/terra/aurora/kp_archive.php?year=YYYY&month=MM&day=DD&ndays=N

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):

http://www.theusner.eu/terra/aurora/kp_archive.php?year=1989&month=10&day=21&ndays=7

Additional info

The activity level classification for the geomagnetic storms follows NOAA's space weather scale for geomagnetic storms. See discussion in the forum of the Arbeitskreis Meteore e.V. (AKM).

All dates and times are UTC.