Real-Time Geomagnetic Data - Stack Plots
Below is a map showing the USGS Geomagnetism Program observatory network.
Click on the observatory name, or choose an observatory from our observatories page, for a profile of each observatory.
View Preliminary Data
A graphical display of preliminary data (updated every 12 minutes) for all observatories is available. These data plots are formed primarily from Internet data, but gaps are filled in with GOES data. These plots have each of the data streams for each observatory on a single plot for that observatory.
Please select a day to view:
Obtaining Recent Preliminary Data
The USGS Geomagnetism Program operates a downlink center in Golden, Colorado for the reception of geomagnetic observatory data via satellite and electronic file exchange. Golden is a Geomagnetic Information Node or GIN, which, as a member of Intermagnet, is one of several GINs located around the world.
Intermagnet data, which include those from USGS observatories, are available through the Intermagnet website on their Intermagnet Data Download page.
Contacts
For requests for Intermagnet CDs, and older USGS CDs, all of which are free of charge:
Jill E Caldwell
jcaldwell@usgs.gov
For general enquiries about USGS Geomagnetism Program data, including specialized requests for USGS data:
Duff C Stewart
dcstewart@usgs.gov
