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Transpolar Arcs Are Not Always Cusp-Aligned: Evidence of HiLDA-Aligned Arcs
KTH, School of Electrical Engineering and Computer Science (EECS), Electrical Engineering, Space and Plasma Physics.ORCID iD: 0000-0001-6252-262X
KTH, School of Electrical Engineering and Computer Science (EECS), Electrical Engineering, Space and Plasma Physics.ORCID iD: 0000-0002-0349-0645
Space Physics and Astronomy, University of Oulu, Oulu, Finland.
KTH, School of Electrical Engineering and Computer Science (EECS), Electrical Engineering, Space and Plasma Physics.ORCID iD: 0000-0003-0554-4691
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2024 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 51, no 21, article id e2024GL111246Article in journal (Refereed) Published
Abstract [en]

Transpolar arcs (TPAs) are often cusp-aligned. Especially when multiple TPAs appear simultaneously, they join at the auroral signature of the cusp. Here we investigate the dayside connection point of TPAs using Defense Meteorological Satellite Program measurements and identify three cases where the tip of the TPA ends in a localized brightening. One is a typical cusp spot with a TPA attached. The cusp appears just poleward of the oval with a near circular shape. In the second case, multiple cusp spots are observed over a 3 MLT wide region, each connected to a TPA. In the third case, the brightening at the tip of a TPA is identified as high-latitude dayside aurora (HiLDA). Cusp aurora appears between the HiLDA and the duskside oval. Plasma flows and particle characteristics indicate a lobe origin of the HiLDA. Our results indicate a more complicated connection between TPAs and dayside aurora than previously anticipated.

Place, publisher, year, edition, pages
American Geophysical Union (AGU) , 2024. Vol. 51, no 21, article id e2024GL111246
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Fusion, Plasma and Space Physics
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URN: urn:nbn:se:kth:diva-356685DOI: 10.1029/2024GL111246ISI: 001368647400001Scopus ID: 2-s2.0-85208603961OAI: oai:DiVA.org:kth-356685DiVA, id: diva2:1914856
Note

QC 20241213

Available from: 2024-11-20 Created: 2024-11-20 Last updated: 2024-12-13Bibliographically approved

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Katrougkalou, Maria ChloiKullen, AnitaRoth, Lorenz

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