Annales Geophysicae
Annales Geophysicae
ANGEO
Articles | Volume 44, issue 1
Articles | Volume 44, issue 1
https://doi.org/10.5194/angeo-44-405-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-44-405-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 44, issue 1
Regular paper
 | 
29 May 2026
Regular paper |  | 29 May 2026

New technique for isolating the auroral contribution in UV imagery: IMF By dependence of seasonal differences in auroral oval location during positive IMF Bz

Jens Christian Hessen, Jone Peter Reistad, Spencer Mark Hatch, Karl Magnus Laundal, and Yongliang Zhang

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Short summary
Auroras, the natural lights seen in Earth's sky near the poles, are shaped by both Earth's and the solar wind's magnetic fields, as well as charged solar particles. This study examines how auroras change when the solar wind's magnetic field is dawn-dusk oriented. Daytime observations are challenging due to sunlight, so we developed a method to further separate auroras from background light. In summer, auroras shift east or west with/against the solar wind's magnetic field.
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