Articles | Volume 43, issue 1
https://doi.org/10.5194/angeo-43-303-2025
https://doi.org/10.5194/angeo-43-303-2025
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11 Jun 2025
Regular paper | Highlight paper |  | 11 Jun 2025

Leaping and vortex motion of the shock aurora toward the late evening sector observed on 26 February 2023

Sota Nanjo, Masatoshi Yamauchi, Magnar Gullikstad Johnsen, Yoshihiro Yokoyama, Urban Brändström, Yasunobu Ogawa, Anna Naemi Willer, and Keisuke Hosokawa

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The study is devoted to a shock auroral event that occurred on February 26, 2023, in northern Scandinavia, and represents the first time such nighttime auroral features have been captured by ground-based cameras. Shock auroras result from a very specific driving impulse in the solar wind. While the primary effects appear on the dayside of the Earth, the authors succeeded in observing the nightside signatures, which are rare and difficult to detect. The study is a successful scientific achievement as it presents newly discovered phenomena that provide new insights into solar wind interactions with the nightside ionosphere.
Short summary
Our research explores the shock aurora, which is typically observed on the dayside due to the rapid compression of the Earth's magnetic field. We observed this rare aurora on the nightside, a region where such events are difficult to detect. Using ground-based cameras, we identified new features, including leaping and vortex-like patterns. These findings offer a fresh insight into the interactions between the solar wind and the magnetosphere, enhancing our understanding of space weather and its effects.
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