Geomagnetic Activity Map

For an accessible format of the hourly values used in the geomagnetic activity map, please view the Geomagnetic Activity Map - Hourly Ranges page.

How to use the Geomagnetic Activity Map application

The magnetic activity maps show the range of the magnetic variation in each hour at Intermagnet observatories around the world. For more recent events, only those observatories with fast reporting capabilities will be shown.

To examine a past event, choose the start date, time and duration and click "Generate". This produces the set of graphics for the event which can then be run through in movie style, stopped, or rerun, as required.

Click an observatory on the map to display a plot of hourly magnetic variations for the time period selected.

Start Date (YYYY-mm-dd)