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      Observations from SANSA's geomagnetic network during the Saint Patrick's Day storm of 17-18 March 2015

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          Abstract

          Geomagnetic storms are space weather events that result in a temporary disturbance of the earth's magnetosphere caused by a solar wind that interacts with the earth's magnetic field. We examined more closely how some southern African magnetic observatories responded to the Saint Patrick's Day storm using local K-indices. We show how this network of observatories may be utilised to model induced electric field, which is useful for the monitoring of geomagnetically induced anomalous currents capable of damaging power distribution infrastructure. We show an example of the correlation between a modelled induced electric field and measured geomagnetically induced currents in southern Africa. The data show that there are differences between global and local indices, which vary with the phases of the storm. We show the latitude dependence of geomagnetic activity and demonstrate that the direction of the variation is different for the X and Y components. SIGNIFICANCE: •The importance of ground-based data in space weather studies is demonstrated. •We show how SANSA's geomagnetic network may be utilised to model induced electric field, which is useful for the monitoring of geomagnetically induced anomalous currents capable of damaging power distribution infrastructure

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          Most cited references20

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          The three-hour-range index measuring geomagnetic activity

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            WhyKpis such a good measure of magnetospheric convection

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              • Abstract: not found
              • Conference Proceedings: not found

              Transformer failures in regions incorrectly considered to have low GIC-risk

                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                sajs
                South African Journal of Science
                S. Afr. j. sci.
                Academy of Science of South Africa (Pretoria, Gauteng, South Africa )
                0038-2353
                1996-7489
                February 2019
                : 115
                : 1-2
                : 1-8
                Affiliations
                [01] Hermanus orgnameSouth African National Space Agency South Africa
                Article
                S0038-23532019000100014
                10.17159/sajs.2019/5204
                323b41bf-d676-48c0-8c88-e48c4b9ee5c7

                This work is licensed under a Creative Commons Attribution 4.0 International License.

                History
                : 19 July 2018
                : 05 June 2018
                : 19 October 2018
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 22, Pages: 8
                Product

                SciELO South Africa

                Categories
                Research Articles

                geomagnetic storms,geomagnetic variations,geomagnetically induced currents

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