Anomalously Large Drivers of GICs
Abstract
Geomagnetically-induced currents (GICs) from space weather drivers result from a combination of properties of the geomagnetic storm, ionospheric currents, and ground conductivity. To investigate the spatial variation in ground magnetic field measurements during geomagnetic storms, we analyzed the SuperMag magnetometer observations from all available stations during Dst(min) < -100 nT storms occurring from 1981-2017. We present results on the maximum horizontal component of the magnetic field and maximum change in magnetic field as a function of magnetic latitude and storm strength. In some cases, we find that more moderate storms result in high dB/dt measurements. We detail these cases and the associated environmental factors that could be contributing to these unexpected rates. Further, we investigate what space weather indices give the best indication of potential GICs by combining this dataset with known significant GIC effects.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2018
- Bibcode:
- 2018AGUFMIN33D0875N
- Keywords:
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- 4313 Extreme events;
- NATURAL HAZARDSDE: 7904 Geomagnetically induced currents;
- SPACE WEATHERDE: 7934 Impacts on technological systems;
- SPACE WEATHERDE: 7999 General or miscellaneous;
- SPACE WEATHER