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Geomagnetic field data for studying GICs on the grid


The gic/usgs and gic/noaa data collections provide access to streaming geomagnetic field data updated once per minute. Data streams from a network of measurement sites each streaming on four channels, reporting the magnitude of the earth’s geomagnetic field (in nanoteslas) in the North, South, and vertical directions.

The data are provided to support studies of geomagnetically induced current (GIC) on the grid, caused by geomagnetic disturbances (GMDs) in the Earth’s magnetic field. The gic/usgs data measures the geomagnetic field at the Earth's surface, while the gic/noaa data provides magnetometer data from a satellite in orbit to provide advanced warning about changes in the density of charged particles (ions) arriving to the Earth from the sun.