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We monitor the Earth's magnetic field. Using ground-based observatories, we provide continuous records of magnetic field variations; disseminate magnetic data to various governmental, academic, and private institutions; and conduct research into the nature of geomagnetic variations for purposes of scientific understanding and hazard mitigation.
Research projects within the USGS Geomagnetism Program are targeted for societal relevance, especially for space-weather hazard science.
The USGS Geomagnetism Program currently operates 14 magnetic observatories. Magnetometer data are collected at these facilities, and the data are then transmitted to Program headquarters in Golden, Colorado.
View reports on magnetic disturbance events.
Download real-time and definitive data and indices from USGS geomagnetic observatories.
Real-time HEZF data from USGS geomagnetic observatories with satellite data used to fill gaps.
Variations building at Guam geomagnetic observatory.
With hurricanes in the east and wildfires in the west, natural hazards have the potential to impact a majority of Americans every year. USGS science provides part of the foundation for emergency preparedness whenever and wherever disaster strikes.
While major geomagnetic storms are rare, with only a few recorded per century, there is significant potential for large-scale impacts when they do occur. Extreme space weather can be viewed as hazards for the economy and national security.
New strides have been made toward quantifying how geomagnetic storms can interfere with the nation’s electric-power grid systems.
September is National Preparedness Month, a time to highlight the resources available to help you and your loved ones stay as safe as possible.
Magnetic storms can interfere with the operation of electric power grids and damage grid infrastructure. They can also disrupt directional drilling for oil and gas, radio communications, communication satellites and GPS systems.
USGS explores the meaning behind Frederic Edwin Church's 1865 painting, “Aurora Borealis.”
Join millions of people participating in America’s PrepareAthon! on Sept. 30. This campaign encourages the nation to conduct drills, discussions and exercises to practice what to do before, during and after a disaster or emergency strikes.