Annales Geophysicae
Annales Geophysicae
ANGEO
Articles | Volume 43, issue 2
Articles | Volume 43, issue 2
https://doi.org/10.5194/angeo-43-723-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-43-723-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 43, issue 2
Regular paper
 | 
25 Nov 2025
Regular paper |  | 25 Nov 2025

Ionospheric signatures of a Bursty Bulk Flow in the 6D Vlasiator simulation

Abiyot Workayehu, Minna Palmroth, Maxime Grandin, Liisa Juusola, Markku Alho, Ivan Zaitsev, Venla Koikkalainen, Konstantinos Horaites, Yann Pfau-Kempf, Urs Ganse, Markus Battarbee, and Jonas Suni

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Short summary

This study investigates the ionospheric signatures of a Bursty Bulk Flow in Earth’s magnetotail using a global 6D hybrid-Vlasov simulation coupled with an ionospheric model. The results show that a reconnection-driven Bursty Bulk Flow generates vortices that produce field-aligned currents, which map to the ionosphere with a distinct east–west orientation and exhibit a characteristic westward drift. Variations in ionospheric observables are identified as clear signatures of this flow.

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