Monitor, Analyze, Protect.

GMD Resources

This section provides links to free resources that are useful in GMD and GIC hazard analysis and planning.

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Geomagnetic Latitude

Click on your location to find your geomagnetic latitude.

Geomagnetic latitude is like the geographic latitude you are used to, but based on the Earth's magnetic pole instead of its rotational axis. Use this tool to find your geomagnetic latitude with a click on a map!

During a geomagnetic storm, the aurora will extend southward in geomagnetic latitude. The larger the GMD, the lower geomagnetic latitude!


Webinars and Short Courses

Sign up for CPI's webinar on 'Using magnetometer data for GIC estimation'

Thursday, March 19, 2020, at 11am MT.

Texas A & M short course: Electric Grid Impacts of Geomagnetic Disturbances

Tues, March 24, 2020 through Thurs, March 26, 2020
Postponed to Fall


Ground Response Models

Ground response models describe how a changing magnetic field relates to the induced electric field that creates the GIC hazard. These resources provide links to commonly-used ground response models.

EPRI Regional Transfer Functions (RTFs)
Earthscope Electromagnetic Transfer Functions (EMTFs)
Geomagnetic activity

Recent storms and space weather

Check back here for more information about recent geomagnetic storms and space weather events.

February 19, 2020 (G1)