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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.

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

The Monitor Newsletter - Vol. 12 | Issue July 2023 - Vol. 12 | Issue July 2023

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
Authors
Jeffrey J. Love, Kalevi Mursula

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 –
Authors
Jeffrey J. Love, E. Joshua Rigler, H. Hayakawa, Kalevi Mursula

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
Authors
Hao Dong, Kai Sun, Gary D. Egbert, Anna Kelbert, Naser Meqbel

Science

September 17, 2024 Magnetic Disturbance

Space Weather Events of September 16, 2024 - September 17, 2024 22:00 Eastern time
link

September 17, 2024 Magnetic Disturbance

Space Weather Events of September 16, 2024 - September 17, 2024 22:00 Eastern time
Learn More

August 12, 2024 Magnetic Disturbance

Space Weather Events of August 12, 2024 - August 12, 2024 15:36 Eastern time
link

August 12, 2024 Magnetic Disturbance

Space Weather Events of August 12, 2024 - August 12, 2024 15:36 Eastern time
Learn More

June 28, 2024

Space Weather Events of June 28, 2024 - June 28, 16:00 Eastern time
link

June 28, 2024

Space Weather Events of June 28, 2024 - June 28, 16:00 Eastern time
Learn More

Multimedia

geomag video thumbnail 5 Geomagnetic Storms that Reshaped Society (AD)
5 Geomagnetic Storms that Reshaped Society (AD)
geomag video thumbnail 5 Geomagnetic Storms that Reshaped Society
5 Geomagnetic Storms that Reshaped Society
Coronal mass ejections (CMEs) move from the surface of the Sun towards Earth through space
Coronal mass ejections (CMEs) move from the surface of the Sun towards Earth through space
Coronal mass ejections (CMEs) move from the surface of the Sun towards Earth through space
Image: Shumagin Geomagnetic Observatory
Shumagin Geomagnetic Observatory
Shumagin Geomagnetic Observatory
Brick signs for Fredericksburg Magnetic Observatory and National Ocean Service.
Geomagnetism Fredericksburg
Geomagnetism Fredericksburg
More signs for Fredericksburg Magnetic Observatory.
Geomagnetism Fredericksburg
Geomagnetism Fredericksburg
Northern lights and stars in sky with snowbank, hills, and trees in foreground.
Aurora Borealis
Aurora Borealis
pastel lights in night sky over mountains
Northern Lights
Northern Lights
Hazards: Geomagnetic Storms
Hazards: Geomagnetic Storms
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