Geomagnetism

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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.

Geomagnetism Program

Geomagnetism Program

Explore the Geomagnetism Program.

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Real-time Geomagnetic Conditions

Real-time Geomagnetic Conditions

Real-time data map display from USGS geomagnetic observatories.

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Geomag Plots

Geomag Plots

Real-time HEZF index display from USGS geomagnetic observatories internet feeds without filling gaps with satellite data.

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News

Date published: March 8, 2018

New 3D Measurements Improve Understanding of Geomagnetic Storm Hazards

Measurements of the three-dimensional structure of the earth, as opposed to the one-dimensional models typically used, can help scientists more accurately determine which areas of the United States are most vulnerable to blackouts during hazardous geomagnetic storms.

Date published: September 6, 2017

USGS Science Leads the Way for National Preparedness

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.

Date published: May 1, 2017

Preparing the Nation for Intense Space Weather

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.

Filter Total Items: 2
Date published: March 2, 2016

Geomagnetism Research

Research projects within the USGS Geomagnetism Program are targeted for societal relevance, especially for space-weather hazard science.

Date published: March 2, 2016

Geomagnetism Monitoring

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.

Filter Total Items: 4
Date published: October 15, 2017

Magnetic Disturbance Events

View reports on magnetic disturbance events.

Date published: April 27, 2016

Download Real-Time Data

Download real-time and definitive data and indices from USGS geomagnetic observatories.

Date published: April 27, 2016

Real-Time Display of Geomagnetism Plots

Real-time HEZF data from USGS geomagnetic observatories with satellite data used to fill gaps.

Date published: April 27, 2016

Real-Time Disturbance Storm Time (Dst) Display

Real-time Dst data from USGS observatories as well as other world partners.

Filter Total Items: 2
Date published: October 16, 2017

Regional Conductivity Maps

Location of 1D Earth Resistivity Models with respect to Physiographic Regions of the USA

Date published: March 7, 2016

Observatories

Map of USGS Magnetic observatory locations.

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Image: Guam Geomagnetic Observatory
August 8, 2011

Guam Geomagnetic Observatory

Guam geomagnetic observatory.

Attribution: Geomagnetism
Image: Guam Geomagnetic Observatory

Guam Geomagnetic Observatory

Variations building at Guam geomagnetic observatory.

Attribution: Geomagnetism
Image: Guam Geomagnetic Observatory

Guam Geomagnetic Observatory

Nema box at Guam geomagnetic observatory.

Attribution: Geomagnetism
Image: Guam Geomagnetic Observatory

Guam Geomagnetic Observatory

Kat Uchima at Guam geomagnetic observatory.

Attribution: Geomagnetism
Filter Total Items: 8
Date published: March 8, 2018

New 3D Measurements Improve Understanding of Geomagnetic Storm Hazards

Measurements of the three-dimensional structure of the earth, as opposed to the one-dimensional models typically used, can help scientists more accurately determine which areas of the United States are most vulnerable to blackouts during hazardous geomagnetic storms.

Date published: September 6, 2017

USGS Science Leads the Way for National Preparedness

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.

Date published: May 1, 2017

Preparing the Nation for Intense Space Weather

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.

Date published: September 12, 2016

Mapping a Space-Weather Menace to Electric-Power Grids

New strides have been made toward quantifying how geomagnetic storms can interfere with the nation’s electric-power grid systems.  

Date published: September 1, 2016

September is National Preparedness Month

September is National Preparedness Month, a time to highlight the resources available to help you and your loved ones stay as safe as possible. 

Date published: January 7, 2016

Getting Down to Earth with Space Hazards

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.

Date published: September 30, 2015

Aurora Borealis Painting Pays Tribute to Civil War’s End

USGS explores the meaning behind Frederic Edwin Church's 1865 painting, “Aurora Borealis.”

Date published: September 28, 2015

Join America’s PrepareAthon! Practice what to do in the event of a disaster or emergency.

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.