Jeffrey J. Love
I am a Research Geophysicist in the Geomagnetism Program of the U.S. Geological Survey (USGS). My research has encompassed a variety of subjects related to the Earth’s magnetic field.
These days, I work in collaboration with colleagues on three subjects: 1. Using geomagnetic monitoring data and magnetotelluric survey data to evaluate geoelectric hazards of concern to the electric-power grid industry. 2. Statistical analysis of the rare occurrences of extremely intense magnetic storms. 3. Analysis of historical records of past space-weather events and their impacts.
Research theme: Geomagnetic Hazards
Magnetic storms; Solar-terrestrial interaction; Magnetotellurics; Induced geoelectric fields; Space climatology; Geophysical monitoring; Rare, extreme, historical geophysical events; Earthquake prediction; Hypothesis testing; Time series analysis; Statistical analysis
Professional Experience
USGS, Golden, CO, Research Geophysicist, Advisor for Geomagnetic Research, 2006 - Present
Institut de Physique du Globe de Paris, Universite Paris Diderot, France, Visiting Professor, September 2015
Institut de Physique du Globe de Paris, Universite Paris Diderot, France, Visiting Research Scientist, October 2012
USGS, Golden, CO, Supervisory Research Geophysicist, Geomagnetism Group Leader, 20
Education and Certifications
Harvard University, Geophysics, Ph.D. 1993
University of California, Berkeley, Physics and Applied Mathematics, A.B. 1985
Affiliations and Memberships*
Space Weather Operations Response and Mitigation (SWORM) of the National Science and Technology Council, 2015 - Present
Electromagnetic Pulse Research and Development (EMPRAD) of the National Science
Science and Products
Filter Total Items: 18
Filter Total Items: 93
Natural hazards science strategy Natural hazards science strategy
The mission of the U.S. Geological Survey (USGS) in natural hazards is to develop and apply hazard science to help protect the safety, security, and economic well-being of the Nation. The costs and consequences of natural hazards can be enormous, and each year more people and infrastructure are at risk. USGS scientific research—founded on detailed observations and improved understanding...
Authors
Robert R. Holmes, Lucile M. Jones, Jeffery C. Eidenshink, Jonathan W. Godt, Stephen H. Kirby, Jeffrey J. Love, Christina A. Neal, Nathaniel G. Plant, Michael L. Plunkett, Craig S. Weaver, Anne Wein, Suzanne C. Perry
Sunspot random walk and 22-year variation Sunspot random walk and 22-year variation
We examine two stochastic models for consistency with observed long-term secular trends in sunspot number and a faint, but semi-persistent, 22-yr signal: (1) a null hypothesis, a simple one-parameter random-walk model of sunspot-number cycle-to-cycle change, and, (2) an alternative hypothesis, a two-parameter random-walk model with an imposed 22-yr alternating amplitude. The observed...
Authors
Jeffrey J. Love, E. Joshua Rigler
On the reported ionospheric precursor of the 1999 Hector Mine, California earthquake On the reported ionospheric precursor of the 1999 Hector Mine, California earthquake
Using Global Positioning System (GPS) data from sites near the 16 Oct. 1999 Hector Mine, California earthquake, Pulinets et al. (2007) identified anomalous changes in the ionospheric total electron content (TEC) starting one week prior to the earthquake. Pulinets (2007) suggested that precursory phenomena of this type could be useful for predicting earthquakes. On the other hand, and in...
Authors
Jeremy N. Thomas, Jeffrey J. Love, Attila Komjathy, Olga P. Verkhoglyadova, Mark Butala, Nicholas Rivera
John B. "Jack" Townshend (1927-2012) John B. "Jack" Townshend (1927-2012)
Jack Townshend, geophysicist and dedicated public servant, died on 13 August 2012 in Fairbanks, Alaska. He was 85. Jack's career with the federal government, most of it with the national magnetic observatory program, spanned more than six solar cycles of time, and he retired only days before his death. The duration of Jack's career encompassed an important period in the history of the...
Authors
Jeffrey J. Love, Carol A. Finn
INTERMAGNET and magnetic observatories INTERMAGNET and magnetic observatories
A magnetic observatory is a specially designed ground-based facility that supports time-series measurement of the Earth’s magnetic field. Observatory data record a superposition of time-dependent signals related to a fantastic diversity of physical processes in the Earth’s core, mantle, lithosphere, ocean, ionosphere, magnetosphere, and, even, the Sun and solar wind.
Authors
Jeffrey J. Love, Arnaud Chulliat
Credible occurrence probabilities for extreme geophysical events: earthquakes, volcanic eruptions, magnetic storms Credible occurrence probabilities for extreme geophysical events: earthquakes, volcanic eruptions, magnetic storms
Statistical analysis is made of rare, extreme geophysical events recorded in historical data -- counting the number of events $k$ with sizes that exceed chosen thresholds during specific durations of time $\tau$. Under transformations that stabilize data and model-parameter variances, the most likely Poisson-event occurrence rate, $k/\tau$, applies for frequentist inference and, also...
Authors
Jeffrey J. Love
Geomagnetic detection of the sectorial solar magnetic field and the historical peculiarity of minimum 23-24 Geomagnetic detection of the sectorial solar magnetic field and the historical peculiarity of minimum 23-24
[1] Analysis is made of the geomagnetic-activityaaindex covering solar cycle 11 to the beginning of 24, 1868–2011. Autocorrelation shows 27.0-d recurrent geomagnetic activity that is well-known to be prominent during solar-cycle minima; some minima also exhibit a smaller amount of 13.5-d recurrence. Previous work has shown that the recent solar minimum 23–24 exhibited 9.0 and 6.7-d...
Authors
Jeffrey J. Love, J. Rigler
The USGS geomagnetism program and its role in space weather monitoring The USGS geomagnetism program and its role in space weather monitoring
Magnetic storms result from the dynamic interaction of the solar wind with the coupled magnetospheric-ionospheric system. Large storms represent a potential hazard for the activities and infrastructure of a modern, technologically based society [Baker et al., 2008]; they can cause the loss of radio communications, reduce the accuracy of global positioning systems, damage satellite...
Authors
Jeffrey J. Love, Carol A. Finn
Are secular correlations between sunspots, geomagnetic activity, and global temperature significant? Are secular correlations between sunspots, geomagnetic activity, and global temperature significant?
Recent studies have led to speculation that solar‐terrestrial interaction, measured by sunspot number and geomagnetic activity, has played an important role in global temperature change over the past century or so. We treat this possibility as an hypothesis for testing. We examine the statistical significance of cross‐correlations between sunspot number, geomagnetic activity, and global...
Authors
Jeffrey J. Love, K. Mursula, V.C. Tsai, D. M. Perkins
USGS 1-min Dst index USGS 1-min Dst index
We produce a 1-min time resolution storm-time disturbance index, the USGS Dst, called Dst8507-4SM. This index is based on minute resolution horizontal magnetic field intensity from low-latitude observatories in Honolulu, Kakioka, San Juan and Hermanus, for the years 1985–2007. The method used to produce the index uses a combination of time- and frequency-domain techniques, which more...
Authors
J.L. Gannon, Jeffrey J. Love
Long-term biases in geomagnetic K and aa indices Long-term biases in geomagnetic K and aa indices
Analysis is made of the geomagnetic-activity aa index and its source K-index data from groups of ground-based observatories in Britain, and Australia, 1868.0–2009.0, solar cycles 11–23. The K data show persistent biases, especially for high (low) K-activity levels at British (Australian) observatories. From examination of multiple subsets of the K data we infer that the biases are not
Authors
Jeffrey J. Love
Science and Products
Filter Total Items: 18
Filter Total Items: 93
Natural hazards science strategy Natural hazards science strategy
The mission of the U.S. Geological Survey (USGS) in natural hazards is to develop and apply hazard science to help protect the safety, security, and economic well-being of the Nation. The costs and consequences of natural hazards can be enormous, and each year more people and infrastructure are at risk. USGS scientific research—founded on detailed observations and improved understanding...
Authors
Robert R. Holmes, Lucile M. Jones, Jeffery C. Eidenshink, Jonathan W. Godt, Stephen H. Kirby, Jeffrey J. Love, Christina A. Neal, Nathaniel G. Plant, Michael L. Plunkett, Craig S. Weaver, Anne Wein, Suzanne C. Perry
Sunspot random walk and 22-year variation Sunspot random walk and 22-year variation
We examine two stochastic models for consistency with observed long-term secular trends in sunspot number and a faint, but semi-persistent, 22-yr signal: (1) a null hypothesis, a simple one-parameter random-walk model of sunspot-number cycle-to-cycle change, and, (2) an alternative hypothesis, a two-parameter random-walk model with an imposed 22-yr alternating amplitude. The observed...
Authors
Jeffrey J. Love, E. Joshua Rigler
On the reported ionospheric precursor of the 1999 Hector Mine, California earthquake On the reported ionospheric precursor of the 1999 Hector Mine, California earthquake
Using Global Positioning System (GPS) data from sites near the 16 Oct. 1999 Hector Mine, California earthquake, Pulinets et al. (2007) identified anomalous changes in the ionospheric total electron content (TEC) starting one week prior to the earthquake. Pulinets (2007) suggested that precursory phenomena of this type could be useful for predicting earthquakes. On the other hand, and in...
Authors
Jeremy N. Thomas, Jeffrey J. Love, Attila Komjathy, Olga P. Verkhoglyadova, Mark Butala, Nicholas Rivera
John B. "Jack" Townshend (1927-2012) John B. "Jack" Townshend (1927-2012)
Jack Townshend, geophysicist and dedicated public servant, died on 13 August 2012 in Fairbanks, Alaska. He was 85. Jack's career with the federal government, most of it with the national magnetic observatory program, spanned more than six solar cycles of time, and he retired only days before his death. The duration of Jack's career encompassed an important period in the history of the...
Authors
Jeffrey J. Love, Carol A. Finn
INTERMAGNET and magnetic observatories INTERMAGNET and magnetic observatories
A magnetic observatory is a specially designed ground-based facility that supports time-series measurement of the Earth’s magnetic field. Observatory data record a superposition of time-dependent signals related to a fantastic diversity of physical processes in the Earth’s core, mantle, lithosphere, ocean, ionosphere, magnetosphere, and, even, the Sun and solar wind.
Authors
Jeffrey J. Love, Arnaud Chulliat
Credible occurrence probabilities for extreme geophysical events: earthquakes, volcanic eruptions, magnetic storms Credible occurrence probabilities for extreme geophysical events: earthquakes, volcanic eruptions, magnetic storms
Statistical analysis is made of rare, extreme geophysical events recorded in historical data -- counting the number of events $k$ with sizes that exceed chosen thresholds during specific durations of time $\tau$. Under transformations that stabilize data and model-parameter variances, the most likely Poisson-event occurrence rate, $k/\tau$, applies for frequentist inference and, also...
Authors
Jeffrey J. Love
Geomagnetic detection of the sectorial solar magnetic field and the historical peculiarity of minimum 23-24 Geomagnetic detection of the sectorial solar magnetic field and the historical peculiarity of minimum 23-24
[1] Analysis is made of the geomagnetic-activityaaindex covering solar cycle 11 to the beginning of 24, 1868–2011. Autocorrelation shows 27.0-d recurrent geomagnetic activity that is well-known to be prominent during solar-cycle minima; some minima also exhibit a smaller amount of 13.5-d recurrence. Previous work has shown that the recent solar minimum 23–24 exhibited 9.0 and 6.7-d...
Authors
Jeffrey J. Love, J. Rigler
The USGS geomagnetism program and its role in space weather monitoring The USGS geomagnetism program and its role in space weather monitoring
Magnetic storms result from the dynamic interaction of the solar wind with the coupled magnetospheric-ionospheric system. Large storms represent a potential hazard for the activities and infrastructure of a modern, technologically based society [Baker et al., 2008]; they can cause the loss of radio communications, reduce the accuracy of global positioning systems, damage satellite...
Authors
Jeffrey J. Love, Carol A. Finn
Are secular correlations between sunspots, geomagnetic activity, and global temperature significant? Are secular correlations between sunspots, geomagnetic activity, and global temperature significant?
Recent studies have led to speculation that solar‐terrestrial interaction, measured by sunspot number and geomagnetic activity, has played an important role in global temperature change over the past century or so. We treat this possibility as an hypothesis for testing. We examine the statistical significance of cross‐correlations between sunspot number, geomagnetic activity, and global...
Authors
Jeffrey J. Love, K. Mursula, V.C. Tsai, D. M. Perkins
USGS 1-min Dst index USGS 1-min Dst index
We produce a 1-min time resolution storm-time disturbance index, the USGS Dst, called Dst8507-4SM. This index is based on minute resolution horizontal magnetic field intensity from low-latitude observatories in Honolulu, Kakioka, San Juan and Hermanus, for the years 1985–2007. The method used to produce the index uses a combination of time- and frequency-domain techniques, which more...
Authors
J.L. Gannon, Jeffrey J. Love
Long-term biases in geomagnetic K and aa indices Long-term biases in geomagnetic K and aa indices
Analysis is made of the geomagnetic-activity aa index and its source K-index data from groups of ground-based observatories in Britain, and Australia, 1868.0–2009.0, solar cycles 11–23. The K data show persistent biases, especially for high (low) K-activity levels at British (Australian) observatories. From examination of multiple subsets of the K data we infer that the biases are not
Authors
Jeffrey J. Love
*Disclaimer: Listing outside positions with professional scientific organizations on this Staff Profile are for informational purposes only and do not constitute an endorsement of those professional scientific organizations or their activities by the USGS, Department of the Interior, or U.S. Government