Mission Areas

Geomagnetism

Programs L2 Landing Page

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.

Explore

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

Giant Sunspot Erupts on October 24, 2014
May 1, 2017

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.

Photograph of the United States at Night
September 12, 2016

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

Shoreline damage due to Hurricane Joaquin
September 1, 2016

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

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USGS science for a changing world logo
March 2, 2016

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

USGS science for a changing world logo
March 2, 2016

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.

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Screenshot of Horizontal Magnetic Intensity website
April 27, 2016

Real-Time H Display (by latitude)

Real-time H index data as displayed above but sorted by latitude

Screenshot of  Blended Real-Time HEZF Display website
April 27, 2016

Blended Real-Time HEZF Display

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

Screenshot of  Real-Time Dst Display website
April 27, 2016

Real-Time Dst Display

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

USGS science for a changing world logo
March 4, 2016

Geomag Data and Products

View our real-time data map display from USGS geomagnetic observatories and more.

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USGS science for a changing world logo
March 7, 2016

Map of USGS Magnetic observatory locations.

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Image: Guam Geomagnetic Observatory
August 8, 2011

Guam geomagnetic observatory.

Image: Guam Geomagnetic Observatory

Variations building at Guam geomagnetic observatory.

Image: Guam Geomagnetic Observatory

Nema box at Guam geomagnetic observatory.

Image: Guam Geomagnetic Observatory

Kat Uchima at Guam geomagnetic observatory.

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Giant Sunspot Erupts on October 24, 2014
May 1, 2017

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.

Photograph of the United States at Night
September 12, 2016

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

Shoreline damage due to Hurricane Joaquin
September 1, 2016

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

A silhouette of a high-voltage power grid against the Sun
January 7, 2016

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.

Aurora silently illuminates a barren and frozen world of mountains, a schooner locked in sea ice, and a man witha dog-drawn sled
September 30, 2015

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

Image: Battle Creek Flooding May 2015, SD
September 28, 2015

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.

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