Geomagnetism Program

Publications

Geomagnetism publications.

View List of Abstracts

Filter Total Items: 416
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Year Published: 2016

Weathering a Perfect Storm from Space

Extreme space-weather events — intense solar and geomagnetic storms — have occurred in the past: most recently in 1859, 1921 and 1989. So scientists expect that, sooner or later, another extremely intense spaceweather event will strike Earth again. Such storms have the potential to cause widespread interference with and damage to...

Love, Jeffrey J.

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Year Published: 2016

Improved geomagnetic referencing in the Arctic environment

Geomagnetic referencing uses the Earth’s magnetic field to determine accurate wellbore positioning essential for success in today's complex drilling programs, either as an alternative or a complement to north-seeking gyroscopic referencing. However, fluctuations in the geomagnetic field, especially at high latitudes, make the application of...

Poedjono, B.; Beck, N.; Buchanan, A. C.; Borri, L.; Maus, S.; Finn, Carol; Worthington, E. William; White, Tim
Poedjono, B., Beck, N., Buchanan, A.,Buchanan, A., Borri, L., Maus, S., Finn, C. A., Worthington, E. W. & White, T., 2013. Improved geomagnetic referencing in the Arctic environment, SPE-166850-MS, SPE Arctic and Extreme Environments Technical Conference and Exhibition, 15-17 October, Moscow, Russia, doi:10.2118/166850-MS.

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Year Published: 2015

Mapping geoelectric fields during magnetic storms: Synthetic analysis of empirical United States impedances

Empirical impedance tensors obtained from EarthScope magnetotelluric data at sites distributed across the midwestern United States are used to examine the feasibility of mapping magnetic storm induction of geoelectric fields. With these tensors, in order to isolate the effects of Earth conductivity structure, we perform a synthetic analysis—...

Bedrosian, Paul A.; Love, Jeffrey J.

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Year Published: 2015

A one-dimensional model of solid-earth electrical resistivity beneath Florida

An estimated one-dimensional layered model of electrical resistivity beneath Florida was developed from published geological and geophysical information. The resistivity of each layer is represented by plausible upper and lower bounds as well as a geometric mean resistivity. Corresponding impedance transfer functions, Schmucker-Weidelt transfer...

Blum, Cletus; Love, Jeffrey J.; Pedrie, Kolby; Bedrosian, Paul A.; Rigler, E. Joshua
Blum, Cletus, Love, J.J., Pedrie, Kolby, Bedrosian, P.A., and Rigler, E.J., 2015, A one-dimensional model of solid-Earth electrical resistivity beneath Florida: U.S. Geological Survey Open-File Report 2015–1185, 16 p., http://dx.doi.org/10.3133/ofr20151185.

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Year Published: 2015

Ionospheric current source modeling and global geomagnetic induction using ground geomagnetic observatory data

Long-period global-scale electromagnetic induction studies of deep Earth conductivity are based almost exclusively on magnetovariational methods and require accurate models of external source spatial structure. We describe approaches to inverting for both the external sources and three-dimensional (3-D) conductivity variations and apply these...

Sun, Jin; Kelbert, Anna; Egbert, G.D.

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Year Published: 2015

Aurora painting pays tribute to Civil War's end

This year marks the sesquicentennial anniversary of the end of the American Civil War, a conflict that Abraham Lincoln called a “mighty scourge.” It was one of the most poignant periods in U.S. history, laying bare political, economic, social, and moral divergence between Northern and Southern states. The cause of the divergence that...

Love, Jeffrey J.

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Year Published: 2015

On the lognormality of historical magnetic storm intensity statistics: Implications for extreme‐event probabilities

An examination is made of the hypothesis that the statistics of magnetic storm maximum intensities are the realization of a lognormal stochastic process. Weighted least squares and maximum likelihood methods are used to fit lognormal functions to −Dst storm time maxima for years 1957–2012; bootstrap analysis is used to established confidence...

Love, Jeffrey J.; Rigler, E. Joshua; Pulkkinen, Antti; Riley, Pete

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Year Published: 2015

Observatory geoelectric fields induced in a two-layer lithosphere during magnetic storms

We report on the development and validation of an algorithm for estimating geoelectric fields induced in the lithosphere beneath an observatory during a magnetic storm. To accommodate induction in three-dimensional lithospheric electrical conductivity, we analyze a simple nine-parameter model: two horizontal layers, each with uniform electrical...

Love, Jeffrey J.; Swidinsky, Andrei

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Year Published: 2015

The Boulder magnetic observatory

The Boulder magnetic observatory has, since 1963, been operated by the Geomagnetism Program of the U.S. Geological Survey in accordance with Bureau and national priorities. Data from the observatory are used for a wide variety of scientific purposes, both pure and applied. The observatory also supports developmental projects within the...

Love, Jeffrey J.; Finn, Carol A.; Pedrie, Kolby L.; Blum, Cletus C.
Love, J.J., Finn, C.A., Pedrie, K.L., and Blum, C.C., 2015, The Boulder magnetic observatory: U.S. Geological Survey Open-File Report 2015–1125, 8 p., http://dx.doi.org/10.3133/ofr20151125.

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Year Published: 2015

On the lognormality of historical magnetic-storm intensity statistics: Implications for extreme-event probabilities

An examination is made of the hypothesis that the statistics of magnetic storm maximum intensities are the realization of a lognormal stochastic process. Weighted least squares and maximum likelihood methods are used to fit lognormal functions to −Dst storm time maxima for years 1957–2012; bootstrap analysis is used to established confidence...

Love, Jeffrey J.; Rigler, E. Joshua; Pulkkinen, Antti; Riley, Pete

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Year Published: 2015

Real-time validation of the Dst Predictor model

The Dst Predictor model, which has been running real-time in the Space Weather Analysis and Forecast System (SWAFS), provides 1-hour and 4-hour forecasts of the Dst index. This is useful for awareness of impending geomagnetic activity, as well as driving other real-time models that use Dst as an input. In this report, we examine the performance of...

McCollough, James P.; Young, Shawn L.; Rigler, E. Joshua; Simpson, Hal A.

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Year Published: 2014

Magnetic storms and induction hazards

Magnetic storms are potentially hazardous to the activities and technological infrastructure of modern civilization. This reality was dramatically demonstrated during the great magnetic storm of March 1989, when surface geoelectric fields, produced by the interaction of the time-varying geomagnetic field with the Earth's electrically conducting...

Love, Jeffrey J.; Rigler, E. Joshua; Pulkkinen, Antti; Balch, Christopher