Results 21 to 30 of about 1,817,388 (196)
Auxiliary Results of Collection and Classification of Surface Geoelectric Arrays [PDF]
, 2007 Recently, we have made a classification of more than one hundred various surface geoelectric arrays ever published in geophysical literature (Szalai and Szarka 2007a, 2007b). The classification is based on three divalent parameters (as “superposition” of
Szarka, László Csaba +3 more
core +2 more sources
Earth and Space Science, 2021 An analysis is made of Earth‐surface geoelectric fields and voltages on electricity transmission power‐grids induced by a late‐phase E3 nuclear electromagnetic pulse (EMP). A hypothetical scenario is considered of an explosion of several hundred kilotons
Jeffrey J. Love +5 more
doaj +1 more source
Toward GIC Forecasting: Statistical Downscaling of the Geomagnetic Field to Improve Geoelectric Field Forecasts [PDF]
Space Weather, 2022 AbstractGeomagnetically induced currents (GICs) are an impact of space weather that can occur during periods of enhanced geomagnetic activity. GICs can enter into electrical power grids through earthed conductors, potentially causing network collapse through voltage instability or damaging transformers.
C. Haines +6 more
openaire +3 more sources
Classification of Surface Geoelectric Arrays [PDF]
, 2007 We have found in the geophysical literature more than ninety different surface geoelectric arrays, fulfilling an updated definition (specifying the current feeding, the potential difference measurement and the geometry of the electrodes).
Szarka, László Csaba, Szalai, Sándor
core +2 more sources
Geomatics, Natural Hazards and Risk, 2023 AbstractThis paper reports three methods of researching the geoelectric index (GEI) based on the ratio between the variation amplitude of geoelectric field on an index calculation day and that on a magnetically quiet day, and uses the three methods to process the observation data of 18 geoelectric stations in China in September 2017.
Junsong Sun +4 more
openaire +2 more sources
Depth of Investigation of Dipole-dipole, Noncolinear and Focused Geoelectric Arrays [PDF]
, 2007 Investigation depth of various DC geoelectric arrays has always been in the focus of interest of geoelectricians. According to its classical definition (Roy and Apparao 1971), the depth of investigation is the depth of the maximum response due to a ...
Szarka, László Csaba +2 more
core +2 more sources
A comparison of methods for estimating the geoelectric field [PDF]
Space Weather, 2017 AbstractThe geoelectric field is the primary input used for estimation of geomagnetically induced currents (GICs) in conducting systems. We compare three methods for estimating the geoelectric field given the measured geomagnetic field at four locations in the U.S.
openaire +1 more source
Space Weather, 2022 A study is made of the relations between geomagnetic and geoelectric field variation, Earth‐surface impedance, and operational interference (“anomalies”) experienced on electric‐power systems across the contiguous United States during the 13–14 March ...
Jeffrey J. Love +5 more
doaj +1 more source
Space Weather, 2021 Estimating the effect of geomagnetic disturbances on power grid infrastructure is an important problem since they can induce damaging currents in electric power transmission lines. In this study, an array of magnetotelluric (MT) impedance measurements in
Darcy Cordell +5 more
doaj +1 more source
Estimating ionospheric currents by inversion from ground-based geomagnetic data and calculating geoelectric fields for studies of geomagnetically induced currents [PDF]
, 2016 This research focuses on the inversion of geomagnetic variation field measurements to obtain the source currents in the ionosphere and magnetosphere, and to determine the geoelectric fields at the Earth’s surface.
J. S. de Villiers +5 more
core +4 more sources