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Auroral Spiral Structure Formation Through Magnetic Reconnection in the Auroral Acceleration Region
Univ Sci & Technol China, Sch Earth & Space Sci, CAS Key Lab Geospace Environm, Hefei, Peoples R China.;CAS Ctr Excellence Comparat Planetol, Hefei, Peoples R China..
Dartmouth Coll, Dept Phys & Astron, Hanover, NH 03755 USA..
Univ Sci & Technol China, Sch Earth & Space Sci, CAS Key Lab Geospace Environm, Hefei, Peoples R China.;CAS Ctr Excellence Comparat Planetol, Hefei, Peoples R China..ORCID iD: 0000-0003-3041-2682
Polar Res Inst China, MNR Key Lab Polar Sci, Shanghai, Peoples R China..
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2022 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 49, no 18, article id e2022GL100466Article in journal (Refereed) Published
Abstract [en]

Auroral spiral is one of the auroral vortex structures. Here, we propose a model to explain the formation of auroral spiral structure based on three-dimensional particle-in-cell simulations. In our model, an auroral arc develops through precipitations of electrons accelerated during magnetic reconnection in the auroral acceleration region. The arc morphology at low altitudes can be modified by electron-scale magnetic flux ropes, which are generated through secondary oblique tearing modes in the intensified current sheet along one particular branch of the primary reconnection separatrices. The resulting vortex structures agree well with high-resolution observations of auroral spirals. We find that the rotational sense of these spirals is determined by electron kinetic processes and controlled by the guide field direction. Our study further suggests that when the field-aligned length of the auroral acceleration region is shorter than a critical length, these auroral spiral structures will not form.

Place, publisher, year, edition, pages
American Geophysical Union (AGU) , 2022. Vol. 49, no 18, article id e2022GL100466
National Category
Environmental Sciences Fusion, Plasma and Space Physics Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:kth:diva-319541DOI: 10.1029/2022GL100466ISI: 000856045300001Scopus ID: 2-s2.0-85139095121OAI: oai:DiVA.org:kth-319541DiVA, id: diva2:1701193
Note

QC 20221005

Available from: 2022-10-05 Created: 2022-10-05 Last updated: 2023-05-29Bibliographically approved

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Vaivads, Andris

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