Instability Mechanisms for the F‐Region Plasma Irregularities Inside the Midlatitude Ionospheric Trough: Swarm Observations
Abstract The midlatitude ionospheric trough (MIT) is a well‐known feature in the topside ionosphere. Previous MIT related studies mainly focused on the MIT structure itself, while few studies focused on irregularities inside the MIT region. In this study, we provided for the first time the magnetic...
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| Format: | Article |
| Language: | English |
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Wiley
2021-07-01
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| Series: | Space Weather |
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| Online Access: | https://doi.org/10.1029/2021SW002785 |
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| author | Yiwen Liu Chao Xiong Xin Wan Yeping Lai Yuhao Wang Xiao Yu Ming Ou |
| author_facet | Yiwen Liu Chao Xiong Xin Wan Yeping Lai Yuhao Wang Xiao Yu Ming Ou |
| author_sort | Yiwen Liu |
| collection | DOAJ |
| description | Abstract The midlatitude ionospheric trough (MIT) is a well‐known feature in the topside ionosphere. Previous MIT related studies mainly focused on the MIT structure itself, while few studies focused on irregularities inside the MIT region. In this study, we provided for the first time the magnetic latitude and magnetic local time distribution of irregularities within the MIT, by using the Swarm in situ plasma measurements. Orbital cases show that both the MIT equatorward and poleward walls are embedded with small‐scale irregularities. Further statistical analysis reveals that the particle precipitation is the dominant mechanism for the dayside MIT region irregularities, while nightside MIT region irregularities are strongly related with the temperature gradient drift instability. The Swarm observations show that the temperature gradient drift instability occur not only in MIT equatorward wall but also in MIT polarward wall, which is different to the theoretical prediction of Hudson and Kelley (1976, https://doi.org/10.1029/JA081i022p03913). |
| format | Article |
| id | doaj-art-c7de67bd62c74d208664bb39b5c28dbf |
| institution | Kabale University |
| issn | 1542-7390 |
| language | English |
| publishDate | 2021-07-01 |
| publisher | Wiley |
| record_format | Article |
| series | Space Weather |
| spelling | doaj-art-c7de67bd62c74d208664bb39b5c28dbf2025-01-14T16:35:19ZengWileySpace Weather1542-73902021-07-01197n/an/a10.1029/2021SW002785Instability Mechanisms for the F‐Region Plasma Irregularities Inside the Midlatitude Ionospheric Trough: Swarm ObservationsYiwen Liu0Chao Xiong1Xin Wan2Yeping Lai3Yuhao Wang4Xiao Yu5Ming Ou6School of Physics and Electronic Information Shangrao Normal University Shangrao ChinaDepartment of Space Physics Electronic Information School Wuhan University Wuhan ChinaPlanetary Environmental and Astrobiological Research Laboratory School of Atmospheric Sciences Sun Yat‐Sen University Zhuhai ChinaSchool of Information Engineering Nanchang University Nanchang ChinaSchool of Physics and Electronic Information Shangrao Normal University Shangrao ChinaChina Research Institute of Radiowave Propagation Qingdao ChinaChina Research Institute of Radiowave Propagation Qingdao ChinaAbstract The midlatitude ionospheric trough (MIT) is a well‐known feature in the topside ionosphere. Previous MIT related studies mainly focused on the MIT structure itself, while few studies focused on irregularities inside the MIT region. In this study, we provided for the first time the magnetic latitude and magnetic local time distribution of irregularities within the MIT, by using the Swarm in situ plasma measurements. Orbital cases show that both the MIT equatorward and poleward walls are embedded with small‐scale irregularities. Further statistical analysis reveals that the particle precipitation is the dominant mechanism for the dayside MIT region irregularities, while nightside MIT region irregularities are strongly related with the temperature gradient drift instability. The Swarm observations show that the temperature gradient drift instability occur not only in MIT equatorward wall but also in MIT polarward wall, which is different to the theoretical prediction of Hudson and Kelley (1976, https://doi.org/10.1029/JA081i022p03913).https://doi.org/10.1029/2021SW002785instability mechanismsF‐region plasmairregularitiesmidlatitude ionospheric trough |
| spellingShingle | Yiwen Liu Chao Xiong Xin Wan Yeping Lai Yuhao Wang Xiao Yu Ming Ou Instability Mechanisms for the F‐Region Plasma Irregularities Inside the Midlatitude Ionospheric Trough: Swarm Observations Space Weather instability mechanisms F‐region plasma irregularities midlatitude ionospheric trough |
| title | Instability Mechanisms for the F‐Region Plasma Irregularities Inside the Midlatitude Ionospheric Trough: Swarm Observations |
| title_full | Instability Mechanisms for the F‐Region Plasma Irregularities Inside the Midlatitude Ionospheric Trough: Swarm Observations |
| title_fullStr | Instability Mechanisms for the F‐Region Plasma Irregularities Inside the Midlatitude Ionospheric Trough: Swarm Observations |
| title_full_unstemmed | Instability Mechanisms for the F‐Region Plasma Irregularities Inside the Midlatitude Ionospheric Trough: Swarm Observations |
| title_short | Instability Mechanisms for the F‐Region Plasma Irregularities Inside the Midlatitude Ionospheric Trough: Swarm Observations |
| title_sort | instability mechanisms for the f region plasma irregularities inside the midlatitude ionospheric trough swarm observations |
| topic | instability mechanisms F‐region plasma irregularities midlatitude ionospheric trough |
| url | https://doi.org/10.1029/2021SW002785 |
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