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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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Title: Observations of fragmented aurora-like emissions and picket fence on the poleward edge of the auroral oval.
Authors: Nanjo, Sota1 (AUTHOR) sota.nanjo@irf.se, Herlingshaw, Katie2 (AUTHOR), Sergienko, Tima1 (AUTHOR), Cessateur, Gaël3 (AUTHOR), Partamies, Noora2 (AUTHOR), Johnsen, Magnar G.4 (AUTHOR), Hosokawa, Keisuke5 (AUTHOR), Lamy, Hervé3 (AUTHOR), Ogawa, Yasunobu6 (AUTHOR), Kero, Antti7 (AUTHOR), Oyama, Shin-ichiro6,8,9 (AUTHOR), Yamauchi, Masatoshi1 (AUTHOR)
Source: Annales Geophysicae (ANGEO) (09927689). 2026, Vol. 44 Issue 1, p63-84. 22p.
Subject Terms: *Plasma instabilities, *Auroras, *Magnetic storms, *Artificial satellites, *Optical sensors, *Particle motion
Geographic Terms: Scandinavia
Abstract: 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. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
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Header DbId: enr
DbLabel: Energy & Power Source
An: 195318182
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  Label: Title
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  Data: Observations of fragmented aurora-like emissions and picket fence on the poleward edge of the auroral oval.
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  Data: <searchLink fieldCode="AR" term="%22Nanjo%2C+Sota%22">Nanjo, Sota</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> sota.nanjo@irf.se</i><br /><searchLink fieldCode="AR" term="%22Herlingshaw%2C+Katie%22">Herlingshaw, Katie</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Sergienko%2C+Tima%22">Sergienko, Tima</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Cessateur%2C+Gaël%22">Cessateur, Gaël</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Partamies%2C+Noora%22">Partamies, Noora</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Johnsen%2C+Magnar G%2E%22">Johnsen, Magnar G.</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Hosokawa%2C+Keisuke%22">Hosokawa, Keisuke</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lamy%2C+Hervé%22">Lamy, Hervé</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ogawa%2C+Yasunobu%22">Ogawa, Yasunobu</searchLink><relatesTo>6</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kero%2C+Antti%22">Kero, Antti</searchLink><relatesTo>7</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Oyama%2C+Shin-ichiro%22">Oyama, Shin-ichiro</searchLink><relatesTo>6,8,9</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yamauchi%2C+Masatoshi%22">Yamauchi, Masatoshi</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Annales+Geophysicae+%28ANGEO%29+%2809927689%29%22">Annales Geophysicae (ANGEO) (09927689)</searchLink>. 2026, Vol. 44 Issue 1, p63-84. 22p.
– Name: Subject
  Label: Subject Terms
  Group: Su
  Data: *<searchLink fieldCode="DE" term="%22Plasma+instabilities%22">Plasma instabilities</searchLink><br />*<searchLink fieldCode="DE" term="%22Auroras%22">Auroras</searchLink><br />*<searchLink fieldCode="DE" term="%22Magnetic+storms%22">Magnetic storms</searchLink><br />*<searchLink fieldCode="DE" term="%22Artificial+satellites%22">Artificial satellites</searchLink><br />*<searchLink fieldCode="DE" term="%22Optical+sensors%22">Optical sensors</searchLink><br />*<searchLink fieldCode="DE" term="%22Particle+motion%22">Particle motion</searchLink>
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  Label: Geographic Terms
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Scandinavia%22">Scandinavia</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: 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. [ABSTRACT FROM AUTHOR]
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=enr&AN=195318182
RecordInfo BibRecord:
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    Identifiers:
      – Type: doi
        Value: 10.5194/angeo-44-63-2026
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 22
        StartPage: 63
    Subjects:
      – SubjectFull: Plasma instabilities
        Type: general
      – SubjectFull: Auroras
        Type: general
      – SubjectFull: Magnetic storms
        Type: general
      – SubjectFull: Artificial satellites
        Type: general
      – SubjectFull: Optical sensors
        Type: general
      – SubjectFull: Particle motion
        Type: general
      – SubjectFull: Scandinavia
        Type: general
    Titles:
      – TitleFull: Observations of fragmented aurora-like emissions and picket fence on the poleward edge of the auroral oval.
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            NameFull: Nanjo, Sota
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            – D: 01
              M: 01
              Text: 2026
              Type: published
              Y: 2026
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              Value: 44
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