New Insights Into the Substorm Initiation Sequence From the Spatio‐Temporal Development of Auroral Electrojets Article Swipe
S. Ohtani
,
T. Motoba
,
J. W. Gjerloev
,
H. U. Frey
,
I. R. Mann
,
Peter Chi
,
H. Korth
·
YOU?
·
· 2022
· Open Access
·
· DOI: https://doi.org/10.1029/2021ja030114
YOU?
·
· 2022
· Open Access
·
· DOI: https://doi.org/10.1029/2021ja030114
In the present study we examine three substorm events, Events 1–3, focusing on the spatio‐temporal development of auroral electrojets (AEJs) before auroral breakup. In Events 1 and 2, auroral breakup was preceded by the equatorward motion of an auroral form, and the ground magnetic field changed northward and southward in the west and east of the expected equatorward flow, respectively. Provided that these magnetic disturbances were caused by local ionospheric Hall currents, this feature suggests that the equatorward flow turned both eastward and westward as it reached the equatorward part of the auroral oval. The auroral breakup took place at the eastward‐turning and westward‐turning branches in Events 1 and 2, respectively, and after the auroral breakup, the westward AEJ enhanced only on the same side of the flow demarcation meridian. The zonal flow divergence is considered as an ionospheric manifestation of the braking of an earthward flow burst in the near‐Earth plasma sheet and subsequent dawnward and duskward turning. Therefore, in Events 1 and 2, the auroral breakup presumably mapped to the dawnward and duskward flow branches, respectively. Moreover, for Event 3, we do not find any pre‐onset auroral or magnetic features that can be associated with an equatorward flow. These findings suggest that the braking of a pre‐onset earthward flow burst itself is not the direct cause of substorm onset, and therefore, the wedge current system that forms at substorm onset is distinct from the one that is considered to form as a consequence of the flow braking.
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- Type
- article
- Language
- en
- Landing Page
- https://doi.org/10.1029/2021ja030114
- https://onlinelibrary.wiley.com/doi/pdfdirect/10.1029/2021JA030114
- OA Status
- hybrid
- Cited By
- 13
- References
- 45
- Related Works
- 10
- OpenAlex ID
- https://openalex.org/W4281257151
All OpenAlex metadata
Raw OpenAlex JSON
- OpenAlex ID
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https://openalex.org/W4281257151Canonical identifier for this work in OpenAlex
- DOI
-
https://doi.org/10.1029/2021ja030114Digital Object Identifier
- Title
-
New Insights Into the Substorm Initiation Sequence From the Spatio‐Temporal Development of Auroral ElectrojetsWork title
- Type
-
articleOpenAlex work type
- Language
-
enPrimary language
- Publication year
-
2022Year of publication
- Publication date
-
2022-05-21Full publication date if available
- Authors
-
S. Ohtani, T. Motoba, J. W. Gjerloev, H. U. Frey, I. R. Mann, Peter Chi, H. KorthList of authors in order
- Landing page
-
https://doi.org/10.1029/2021ja030114Publisher landing page
- PDF URL
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https://onlinelibrary.wiley.com/doi/pdfdirect/10.1029/2021JA030114Direct link to full text PDF
- Open access
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YesWhether a free full text is available
- OA status
-
hybridOpen access status per OpenAlex
- OA URL
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https://onlinelibrary.wiley.com/doi/pdfdirect/10.1029/2021JA030114Direct OA link when available
- Concepts
-
Substorm, Sequence (biology), Geophysics, Time sequence, Geology, Physics, Computer science, Magnetosphere, Artificial intelligence, Biology, Plasma, Genetics, Quantum mechanicsTop concepts (fields/topics) attached by OpenAlex
- Cited by
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13Total citation count in OpenAlex
- Citations by year (recent)
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2025: 2, 2024: 5, 2023: 2, 2022: 4Per-year citation counts (last 5 years)
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45Number of works referenced by this work
- Related works (count)
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10Other works algorithmically related by OpenAlex
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