[PDF] Top 20 Extreme geomagnetically induced currents

... ionospheric currents but also upward field-aligned currents induce a negative north- south (H-component) excursion at middle to low lati- tudes in the pre-noon sector during ... See full document

... are plotted with thicker lines. We see that these extreme values clearly restrict the range of | I | . Actually | I | never reaches a value that is even very close to either of the ex- tremes in the 100000 runs ... See full document

... This paper also provides new theoretical and numerical analyses of the properties of the transfer matrix between the geovoltages and the earthing GICs in a power system. A particular result, which is important in ... See full document

... “Geomagnetically induced currents” (GIC) in ground-based technological networks are a manifestation of space weather. GIC are a potential source of problems to the systems and therefore important in ... See full document

... (EEJ) currents were fi rst reported by Egedal [1947] to exist in the equatorial ionosphere when the Huancayo geomagnetic observatory started operations in ...these currents at high latitudes has been ... See full document

... low-latitude geomagnetically induced currents effects on transformers in Nairobi, Kenya, In: Proceedings of the Workshop on GICs in Power Systems with Emphasis on mid- and low-latitude regions, ... See full document

... Geomagnetically Induced Currents (GICs) are electrical currents induced in ground-level conductive networks, like power lines and pipelines, which can cause costly damage to ...are ... See full document

... of 2003, the Committee on Solar and Space Physics (CSSP) of the U.S. National Research Council (NRC) began to consider the need to systematically assess the so- cial and economic impacts of space weather. To establish ... See full document

... during extreme winds and called "chernomorka" (reverse surface wind) are ...to extreme storms is ...the currents induced by the storm winds demonstrates that in the sea surface layer ... See full document

... the induced telluric current flowing in the conducting ...resulting induced electric field at the Earth’s surface is needed ...netically Induced Currents (GIC) that flow in man-made conductor ... See full document

... of geomagnetically induced current (GIC), magnetic field and geoelectric field observations are ...of induced currents in any technological system experiencing ... See full document

... Using a DC power source as a proxy of GICs, Takasu et al. (1994) performed experiments on DC excitation for scale models with linear dimensions that were one third to one half of those of actual power transformers. ... See full document

... harmonic currents from saturated transformers. The flow of these harmonic currents can cause the capacitor overvoltage or overcurrent protection to trip [52, ... See full document

... The geoelectric field has also been used as a proxy for GIC in other studies (e.g. Zheng et al. 2013). Further- more, Viljanen et al. (2004) and Wik et al. (2008) both take horizontal geomagnetic field data and compute ... See full document

... any extreme geomagnetic storms during the current solar cycle, major non-Earth-directed coronal mass ejections (CMEs) have been observed and analyzed in the extreme event context ...that extreme ... See full document

... Surface electric fields and geomagnetically induced currents in the Scottish Power grid during the 30 October 2003 geomagnetic storm,.. Quantifying extreme behaviour in geo- magnetic act[r] ... See full document

... Geomagnetic induced current enters the power network and cause changes in real and reactive power due to which voltage fluctuates and frequency of system ...harmonic currents generated by a saturated ... See full document

... ionospheric currents during substorms happen in the vicinity of local midnight, and thus, one is tempted to propose that substorms are also in a statistical sense the most important cause for large GIC in the ... See full document

... netically induced currents (GIC) are flowing into high- voltage power grids and high-voltage power transformer windings with dead-earthed neutral, which in turns create asymmetric saturation of magnetic ... See full document

... These large GIC values were generated with a fixed set of conductivity model parameters. Until now, there has been little investigation into the sensitivity of the GIC values to variation in the geophysical conductance ... See full document