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    Observations of fragmented aurora-like emissions and picket fence on the poleward edge of the auroral oval

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    Nanjo(2026a).pdf (18.79Mb)
    Authors
    Nanjo, S.
    Herlingshaw, K.
    Sergienko, T.
    Cessateur, G.
    Partamies, N.
    Johnsen, M. G.
    Hosokawa, K.
    Lamy, H.
    Ogawa, Y.
    Kero, A.
    Oyama, S.
    Yamauchi, M.
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    Discipline
    Physical sciences
    Audience
    Scientific
    Date
    2026
    Metadata
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    Description
    We analyzed fragmented auroral-like emissions (FAEs) and picket fence structures observed in northern Scandinavia during a magnetic storm on 1 January 2025. The analysis is based on ground-based high-sensitivity optical observations and in-situ measurements from the Swarm satellites. While FAEs and picket fences have previously been reported in the polar cap and subauroral region, respectively, this study reports simultaneous occurrences of both phenomena in auroral latitudes, near the poleward edge of the oval. Ground-based camera observations revealed that some FAEs exhibited orientations closely aligned with the modeled local magnetic field in the image plane and appeared simultaneously at multiple longitudinally separated locations. Furthermore, the FAEs appeared to follow the motion of red auroras, suggesting that the background electric field structure and spatial gradients in the electron density may influence their formation. Consistent with previous studies, the generation of FAEs is considered to be due to local acceleration of electrons in the ionosphere rather than electron precipitation from the magnetosphere. While we could not clearly identify the generation mechanisms, the morphological diversity observed in this event suggests that multiple plasma instabilities may be involved in the generation of both FAEs and picket fence structures.
    Citation
    Nanjo, S.; Herlingshaw, K.; Sergienko, T.; Cessateur, G.; Partamies, N.; Johnsen, M. G.; Hosokawa, K.; Lamy, H.; Ogawa, Y.; Kero, A.; Oyama, S.; Yamauchi, M. (2026). Observations of fragmented aurora-like emissions and picket fence on the poleward edge of the auroral oval. , Annales Geophysicae, Vol. 44, Issue 1, 63-84, DOI: 10.5194/angeo-44-63-2026.
    Identifiers
    uri: https://orfeo.belnet.be/handle/internal/14582
    doi: http://dx.doi.org/10.5194/angeo-44-63-2026
    url:
    Type
    Article
    Peer-Review
    Yes
    Language
    eng
    Links
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