Geomagnetism Program
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.
Magnetic Disturbance Event Summaries
Magnetic Disturbance Event Summaries
Summaries of extreme geomagnetic events caused by solar flares.
5 Geomagnetic Storms that Shaped Society
5 Geomagnetic Storms that Shaped Society
While our attention turns toward the upcoming solar peak, we thought it would be a good time to reflect on …five geomagnetic storms that have reshaped society.
News
Recently completed geophysical survey will help protect critical infrastructure from geomagnetic storms and space weather
Recently completed geophysical survey will help protect critical infrastructure from geomagnetic storms and space weather
5 Geomagnetic Storms That Reshaped Society
5 Geomagnetic Storms That Reshaped Society
Publications
Challenging ring-current models of the Carrington storm
A detailed analysis is made of horizontal-component geomagnetic-disturbance data acquired at the Colaba observatory in India recording the Carrington magnetic storm of September 1859. Prior to attaining its maximum absolute value, disturbance at Colaba increased with an e-folding timescale of 0.46 hr (28 min). Following its maximum, absolute disturbance at Colaba decreased as a trend having an e-f
On the uncertain intensity estimate of the 1859 Carrington storm
A study is made of the intensity of the Carrington magnetic storm of September 1859 as inferred from visual measurements of horizontal-component geomagnetic disturbance made at the Colaba observatory in India. Using data from modern observatories, a lognormal statistical model of storm intensity is developed, to characterize the maximum-negative value of the storm-time disturbance index (maximum –
Hybrid CPU-GPU solution to regularized divergence-free curl-curl equations for electromagnetic inversion problems
The Curl-Curl equation is the foundation of time-harmonic electromagnetic (EM) problems in geophysics. The efficiency of its solution is key to EM simulations, accounting for over 95% of the computation cost in geophysical inversions for magnetotelluric or controlled-source EM problems. However, most published EM inversion codes are still central processing unit (CPU)-based and cannot utilize rece
Science
September 17, 2024 Magnetic Disturbance
Space Weather Events of September 16, 2024 - September 17, 2024 22:00 Eastern time
August 12, 2024 Magnetic Disturbance
Space Weather Events of August 12, 2024 - August 12, 2024 15:36 Eastern time
June 28, 2024
Space Weather Events of June 28, 2024 - June 28, 16:00 Eastern time
