Highlights
Mapping Extreme-Value Geoelectric Fields
Preparing the Nation for Intense Space Weather
Video - Hazards: Geomagnetic Storms
View "Hazards: Geomagnetic Storms" - a 7-minute introductory video
Latest Magnetic Disturbance Event
Event: 2015-06-23
Maximum Dst Amplitude -195 nT
A “severe” storm occurred on June 21-23, 2015. This storm arose in response to variable solar-wind conditions that the Space Weather Prediction Center of the National Oceanic and Atmospheric Administration (SWPC, NOAA) associated with active region 2371 on the Sun. A series of 3 coronal mass ejections (CMEs) originated from this active region. These were subsequently recorded by NASA’s Advanced Composition Explorer (ACE) satellite, located on the Sun-Earth line at a distance approximately 1% of the distance from the Earth to the Sun, as abrupt enhancements in solar-wind velocity and density. With the arrival of the CMEs at the Earth on about June 21 16:45 UT, June 22 05:45 UT, and June 22 18:30 UT, concomitant increases in solar-wind ram pressure abruptly compressed the Earth’s magnetosphere. These generated eastward-flowing magnetopause electric currents and positive perturbations in the horizontal component of the geomagnetic field recorded at low-latitude magnetic observatories around the world, including at USGS observatories in Guam, Honolulu, and San Juan.
-
Monitoring
Get information on how our magnetic observatories collect and transfer data and find sources for data outside of the United States
-
Data & Products
View graphs of real-time magnetic data from USGS and partner observatories and download historical definitive data'
-
Research
Get information about research being done by the USGS Geomagnetism Program and view publications by our researchers
-
Publications
Scientific publications listed by year.
-
Learn
Learn about Earth's magnetic field, space weather, magnetism and more
-
Services
The USGS Geomagnetism Program provides some services such as Compass Rose Surveys to governmental, academic and private communities
-
Partners & Customers
Meet the public and private groups and companies that contribute to our program and benefit from our services