Academic Journal

Transpolar Arcs Are Not Always Cusp‐Aligned: Evidence of HiLDA‐Aligned Arcs

Bibliographic Details
Title:	Transpolar Arcs Are Not Always Cusp‐Aligned: Evidence of HiLDA‐Aligned Arcs
Authors:	Maria Chloi Katrougkalou, Anita Kullen, Lei Cai, Lorenz Roth, Yongliang Zhang
Source:	Geophysical Research Letters, Vol 51, Iss 21, Pp n/a-n/a (2024)
Publisher Information:	Wiley, 2024.
Publication Year:	2024
Collection:	LCC:Geophysics. Cosmic physics
Subject Terms:	Geophysics. Cosmic physics, QC801-809
More Details:	Abstract 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.
Document Type:	article
File Description:	electronic resource
Language:	English
ISSN:	1944-8007 0094-8276
Relation:	https://doaj.org/toc/0094-8276; https://doaj.org/toc/1944-8007
DOI:	10.1029/2024GL111246
Access URL:	https://doaj.org/article/c71d0dc7253f460082dc4d042aec5d7c
Accession Number:	edsdoj.71d0dc7253f460082dc4d042aec5d7c
Database:	Directory of Open Access Journals

More Details
ISSN:	19448007 00948276
DOI:	10.1029/2024GL111246
Published in:	Geophysical Research Letters
Language:	English