Field‐Aligned Currents Induced by Magnetopause Motions Under Pressure Perturbations
Abstract In this work, we identified 65 auroral arcs that stretched out from the equatorward boundary of auroral oval with azimuthal extensions, and investigated their upstream triggering, by utilizing conjunctions between the THEMIS probes and the all‐sky imagers at AGO P1 and South Pole stations....
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| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2025-01-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2024GL111958 |
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| author | Boyi Wang Xinyu Xu Yukitoshi Nishimura Yen‐Jung Wu Zhonghua Xu Primož Kajdic De‐Sheng Han Yi Wang Xueshang Feng |
| author_facet | Boyi Wang Xinyu Xu Yukitoshi Nishimura Yen‐Jung Wu Zhonghua Xu Primož Kajdic De‐Sheng Han Yi Wang Xueshang Feng |
| author_sort | Boyi Wang |
| collection | DOAJ |
| description | Abstract In this work, we identified 65 auroral arcs that stretched out from the equatorward boundary of auroral oval with azimuthal extensions, and investigated their upstream triggering, by utilizing conjunctions between the THEMIS probes and the all‐sky imagers at AGO P1 and South Pole stations. The results show that the magnetopause motions induced by pressure enhancements associated with IMF discontinuities or foreshock cavities likely generate upward FACs in the closed field lines near the magnetopause. The inward and azimuthal motions of magnetopause caused equatorward‐moving auroral arcs, which extended westward or eastward, centered in the prenoon (12–13 MLT) or postnoon (9–10 MLT) sectors, respectively. The dawn‐dusk asymmetry in this distribution may be due to the contribution from foreshock activities. Furthermore, stronger compression can push the magnetopause further inward, causing FACs and the corresponding discrete auroras to be distributed over a wider region extending further in both latitude and local time. |
| format | Article |
| id | doaj-art-47c4298eb5ea404dbd8c4059f1abdeaf |
| institution | Kabale University |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-47c4298eb5ea404dbd8c4059f1abdeaf2025-01-20T13:05:57ZengWileyGeophysical Research Letters0094-82761944-80072025-01-01521n/an/a10.1029/2024GL111958Field‐Aligned Currents Induced by Magnetopause Motions Under Pressure PerturbationsBoyi Wang0Xinyu Xu1Yukitoshi Nishimura2Yen‐Jung Wu3Zhonghua Xu4Primož Kajdic5De‐Sheng Han6Yi Wang7Xueshang Feng8School of Aerospace Science Harbin Institute of Technology (Shenzhen) Shenzhen ChinaSchool of Aerospace Science Harbin Institute of Technology (Shenzhen) Shenzhen ChinaDepartment of Electrical and Computer Engineering and Center for Space Physics Boston University Boston MA USASpace Sciences Laboratory University of California Berkeley Berkeley CA USACenter for Space Science and Engineering Research Virginia Tech Blacksburg VA USADepartamento de Ciencias Espaciales Instituto de Geofísica Universidad Nacional Autónoma de México Mexico City MexicoState Key Laboratory of Marine Geology School of Ocean and Earth Science Tongji University Shanghai ChinaSchool of Aerospace Science Harbin Institute of Technology (Shenzhen) Shenzhen ChinaSchool of Aerospace Science Harbin Institute of Technology (Shenzhen) Shenzhen ChinaAbstract In this work, we identified 65 auroral arcs that stretched out from the equatorward boundary of auroral oval with azimuthal extensions, and investigated their upstream triggering, by utilizing conjunctions between the THEMIS probes and the all‐sky imagers at AGO P1 and South Pole stations. The results show that the magnetopause motions induced by pressure enhancements associated with IMF discontinuities or foreshock cavities likely generate upward FACs in the closed field lines near the magnetopause. The inward and azimuthal motions of magnetopause caused equatorward‐moving auroral arcs, which extended westward or eastward, centered in the prenoon (12–13 MLT) or postnoon (9–10 MLT) sectors, respectively. The dawn‐dusk asymmetry in this distribution may be due to the contribution from foreshock activities. Furthermore, stronger compression can push the magnetopause further inward, causing FACs and the corresponding discrete auroras to be distributed over a wider region extending further in both latitude and local time.https://doi.org/10.1029/2024GL111958magnetopauseforeshockaurorafield‐aligned currents |
| spellingShingle | Boyi Wang Xinyu Xu Yukitoshi Nishimura Yen‐Jung Wu Zhonghua Xu Primož Kajdic De‐Sheng Han Yi Wang Xueshang Feng Field‐Aligned Currents Induced by Magnetopause Motions Under Pressure Perturbations Geophysical Research Letters magnetopause foreshock aurora field‐aligned currents |
| title | Field‐Aligned Currents Induced by Magnetopause Motions Under Pressure Perturbations |
| title_full | Field‐Aligned Currents Induced by Magnetopause Motions Under Pressure Perturbations |
| title_fullStr | Field‐Aligned Currents Induced by Magnetopause Motions Under Pressure Perturbations |
| title_full_unstemmed | Field‐Aligned Currents Induced by Magnetopause Motions Under Pressure Perturbations |
| title_short | Field‐Aligned Currents Induced by Magnetopause Motions Under Pressure Perturbations |
| title_sort | field aligned currents induced by magnetopause motions under pressure perturbations |
| topic | magnetopause foreshock aurora field‐aligned currents |
| url | https://doi.org/10.1029/2024GL111958 |
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