| Title | Analytic calculation of geoelectric fields due to geomagnetic disturbances: a test case |
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| Author | Boteler, D H ;
Pirjola, R J; Marti, L |
| Source | IEEE Access vol. 7, 2019 p. 147029-147037, https://doi.org/10.1109/ACCESS.2019.2945530  Open Access |
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| Year | 2019 |
| Alt Series | Natural Resources Canada, Contribution Series 20180403 |
| Publisher | Institute of Electrical and Electronics Engineers |
| Document | serial |
| Lang. | English |
| Media | on-line; digital |
| File format | pdf |
| Subjects | geophysics; Science and Technology; Nature and Environment; Health and Safety; geomagnetic fields; geomagnetic variations; geoelectric variations; ionosphere; ionospheric currents; magnetosphere;
magnetospheric currents; modelling; conductivity; software; Infrastructures |
| Illustrations | tables; bar graphs; plots; models; time series; photographs |
| Program | Public Safety Geoscience Northern Canada Geohazards Project |
| Released | 2019 10 04 |
| Abstract | Geomagnetic field variations produce geoelectric fields that can affect the operation of technological networks at the Earth's surface, including power systems, pipelines, phone cables and railway
circuits. To assess the geomagnetic hazard to this technology, it is necessary to model the geomagnetically induced currents (GIC) produced in these systems during geomagnetic disturbances. This requires use of geomagnetic data with appropriate Earth
conductivity models to calculate the geoelectric fields that drive GIC. To provide a way of testing geoelectric field calculation software, we provide a benchmark test case by defining a synthetic geomagnetic field variation and deriving exact
analytic expressions for the Earth response based on both uniform and layered Earth conductivity models. These are then used to provide exact analytic expressions for the geoelectric fields that would be produced by the synthetic geomagnetic field
variation. The synthetic geomagnetic data can be used as input to numerical geoelectric field calculation software, the output of which can be tested by comparison with the analytically-generated geoelectric fields. |
| Summary | (Plain Language Summary, not published)
Space weather refers to the dynamic conditions on the Sun and in the space environment, in particular, in the near-Earth environment, that can affect
critical infrastructure. NRCan operates the Canadian Space Weather Forecast Centre and conducts research into space weather effects on power systems, pipelines, radio communications and GNSS positioning to help Canadian industry understand and
mitigate the effects of space weather. This paper describes a test case for testing geoelectric field calculation software. We define a synthetic geomagnetic field variation and derive exact analytic expressions for the Earth response based on
both uniform and layered Earth conductivity models. These are then used to provide exact analytic expressions for the geoelectric fields that would be produced by the synthetic geomagnetic field variation. This is useful for testing software used in
assessing the geomagnetic hazards to critical infrastructure such as power systems and pipelines. |
| GEOSCAN ID | 313683 |
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