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Location of geomagnetic disturbances in relation to the field aligned current boundary
School of Physics and Astronomy, University of Leicester, Leicester, United Kingdom.
School of Physics and Astronomy, University of Leicester, Leicester, United Kingdom.
School of Physics and Astronomy, University of Leicester, Leicester, United Kingdom.
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för fysik. School of Physics and Astronomy, University of Leicester, Leicester, United Kingdom.ORCID-id: 0000-0001-6968-5405
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2024 (Engelska)Ingår i: Journal of Geophysical Research - Space Physics, ISSN 2169-9380, E-ISSN 2169-9402, Vol. 129, nr 10, artikel-id e2024JA033039Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Geomagnetic disturbances (GMDs) are rapid fluctuations in the strength and direction of the magnetic field near the surface of the Earth which can cause electric currents to be induced in the ground. The geomagnetically induced currents (GICs) can cause damage to pipelines and power grids. A detection algorithm has been developed to identify rapid changes in 10 s averaged magnetometer data. This higher resolution data is important in capturing the most rapid changes associated with extreme GIC events. The algorithm has been used on an array of ground-based magnetometers from SuperMAG data from 2010 to 2022, creating a new list of global GMDs. Data from the Active Magnetosphere and Planetary Electrodynamics Response Experiment (AMPERE) is used to place the observed GMDs in the context of the global pattern of magnetosphere-ionosphere field-aligned currents (FACs). A dawn sector population of GMDs is found to lie near the boundary between the region 1 and region 2 FACs, while a pre-midnight sector population is found to occur poleward of the FAC boundary on region 1 upward FACs. It is also shown that the latitude of the GMDs expands with the FAC boundary and their occurrence peaks around 77° magnetic latitude.

Ort, förlag, år, upplaga, sidor
American Geophysical Union (AGU), 2024. Vol. 129, nr 10, artikel-id e2024JA033039
Nyckelord [en]
field aligned currents, geomagnetic disturbances, geomagnetically induced currents, solar wind
Nationell ämneskategori
Fusion, plasma och rymdfysik Astronomi, astrofysik och kosmologi
Identifikatorer
URN: urn:nbn:se:umu:diva-230965DOI: 10.1029/2024JA033039ISI: 001326232100001Scopus ID: 2-s2.0-85205987455OAI: oai:DiVA.org:umu-230965DiVA, id: diva2:1908259
Forskningsfinansiär
Vetenskapsrådet, 2021‐06683Tillgänglig från: 2024-10-25 Skapad: 2024-10-25 Senast uppdaterad: 2024-10-25Bibliografiskt granskad

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Schillings, Audrey

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Fusion, plasma och rymdfysikAstronomi, astrofysik och kosmologi

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