Annales Geophysicae
Annales Geophysicae
ANGEO
Articles | Volume 43, issue 2
Articles | Volume 43, issue 2
https://doi.org/10.5194/angeo-43-447-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-43-447-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 43, issue 2
Regular paper
 | 
27 Aug 2025
Regular paper |  | 27 Aug 2025

Small-scale and mesoscale field-aligned auroral current structures: their spatial and temporal characteristics deduced by the Swarm constellation

Hermann Lühr and Yun-Liang Zhou

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Short summary
The study makes use of magnetic field data from the closely spaced Swarm A and C spacecraft during the counter-rotating orbit phase. It allows investigating the spatial and temporal correlation lengths of small-scale and mesoscale FAC (field-aligned current) structures at auroral latitudes. Stationarity features of small-scale FACs (10–50 km scale size) are temporal length < 18 s and correlation length < 12 km. For mesoscale FACs (75–220 km scales) we obtain a stability of > 40 s and correlation length > 20 km.
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