Theoretical study of the ionospheric dynamo region inside the South Atlantic Anomaly
The South Atlantic Anomaly (SAA) is a region where the geomagnetic field is significantly lower than that of the surrounding area. On the basis of the models of CHAOS-7.8, Mass Spectrometer Incoherent Scatter Model (NRLMSISE-00), and International Reference Ionosphere 2016 (IRI-2016), we theoretical...
| Main Authors: | , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Science Press
2023-01-01
|
| Series: | Earth and Planetary Physics |
| Subjects: | |
| Online Access: | http://www.eppcgs.org/article/doi/10.26464/epp2023015?pageType=en |
| _version_ | 1797961158002475008 |
|---|---|
| author | SiQi Yi XiaoJun Xu ZiLu Zhou Qing Chang Xing Wang Lei Luo PeiShan He Hui Li |
| author_facet | SiQi Yi XiaoJun Xu ZiLu Zhou Qing Chang Xing Wang Lei Luo PeiShan He Hui Li |
| author_sort | SiQi Yi |
| collection | DOAJ |
| description | The South Atlantic Anomaly (SAA) is a region where the geomagnetic field is significantly lower than that of the surrounding area. On the basis of the models of CHAOS-7.8, Mass Spectrometer Incoherent Scatter Model (NRLMSISE-00), and International Reference Ionosphere 2016 (IRI-2016), we theoretically investigated the lower and upper boundaries of the ionospheric dynamo region inside the SAA. In the ionospheric dynamo region, electrons are coupled with magnetic field lines, whereas ions are decoupled from magnetic field lines. Our results showed that the ionospheric dynamo region inside the SAA is higher and larger than that outside the SAA. We also studied the boundary variations of the dynamo region inside the SAA depending on the seasons and solar activities. We found that the dynamo region inside the SAA is the highest and largest in the summer of the southern hemisphere at solar maximum. The larger and higher altitude range of the ionospheric dynamo region in the SAA can contribute to the stronger ionospheric currents in this region. |
| first_indexed | 2024-04-11T00:55:00Z |
| format | Article |
| id | doaj.art-f4b19cc55b6c4742b0250744430095f4 |
| institution | Directory Open Access Journal |
| issn | 2096-3955 |
| language | English |
| last_indexed | 2024-04-11T00:55:00Z |
| publishDate | 2023-01-01 |
| publisher | Science Press |
| record_format | Article |
| series | Earth and Planetary Physics |
| spelling | doaj.art-f4b19cc55b6c4742b0250744430095f42023-01-05T06:35:25ZengScience PressEarth and Planetary Physics2096-39552023-01-0171849210.26464/epp202301510-yisiqi-xuxiaojun-FTheoretical study of the ionospheric dynamo region inside the South Atlantic AnomalySiQi Yi0XiaoJun Xu1ZiLu Zhou2Qing Chang3Xing Wang4Lei Luo5PeiShan He6Hui Li7State Key Laboratory of Lunar and Planetary Sciences, Macau University of Science and Technology, Taipa Macao 999078, ChinaState Key Laboratory of Lunar and Planetary Sciences, Macau University of Science and Technology, Taipa Macao 999078, ChinaState Key Laboratory of Lunar and Planetary Sciences, Macau University of Science and Technology, Taipa Macao 999078, ChinaState Key Laboratory of Lunar and Planetary Sciences, Macau University of Science and Technology, Taipa Macao 999078, ChinaState Key Laboratory of Lunar and Planetary Sciences, Macau University of Science and Technology, Taipa Macao 999078, ChinaState Key Laboratory of Lunar and Planetary Sciences, Macau University of Science and Technology, Taipa Macao 999078, ChinaState Key Laboratory of Lunar and Planetary Sciences, Macau University of Science and Technology, Taipa Macao 999078, ChinaState Key Laboratory of Space Weather, National Space Science Center, Chinese Academy of Sciences, Beijing 100190, ChinaThe South Atlantic Anomaly (SAA) is a region where the geomagnetic field is significantly lower than that of the surrounding area. On the basis of the models of CHAOS-7.8, Mass Spectrometer Incoherent Scatter Model (NRLMSISE-00), and International Reference Ionosphere 2016 (IRI-2016), we theoretically investigated the lower and upper boundaries of the ionospheric dynamo region inside the SAA. In the ionospheric dynamo region, electrons are coupled with magnetic field lines, whereas ions are decoupled from magnetic field lines. Our results showed that the ionospheric dynamo region inside the SAA is higher and larger than that outside the SAA. We also studied the boundary variations of the dynamo region inside the SAA depending on the seasons and solar activities. We found that the dynamo region inside the SAA is the highest and largest in the summer of the southern hemisphere at solar maximum. The larger and higher altitude range of the ionospheric dynamo region in the SAA can contribute to the stronger ionospheric currents in this region.http://www.eppcgs.org/article/doi/10.26464/epp2023015?pageType=ensouth atlantic anomalyionospheric dynamo regionionosphere |
| spellingShingle | SiQi Yi XiaoJun Xu ZiLu Zhou Qing Chang Xing Wang Lei Luo PeiShan He Hui Li Theoretical study of the ionospheric dynamo region inside the South Atlantic Anomaly Earth and Planetary Physics south atlantic anomaly ionospheric dynamo region ionosphere |
| title | Theoretical study of the ionospheric dynamo region inside the South Atlantic Anomaly |
| title_full | Theoretical study of the ionospheric dynamo region inside the South Atlantic Anomaly |
| title_fullStr | Theoretical study of the ionospheric dynamo region inside the South Atlantic Anomaly |
| title_full_unstemmed | Theoretical study of the ionospheric dynamo region inside the South Atlantic Anomaly |
| title_short | Theoretical study of the ionospheric dynamo region inside the South Atlantic Anomaly |
| title_sort | theoretical study of the ionospheric dynamo region inside the south atlantic anomaly |
| topic | south atlantic anomaly ionospheric dynamo region ionosphere |
| url | http://www.eppcgs.org/article/doi/10.26464/epp2023015?pageType=en |
| work_keys_str_mv | AT siqiyi theoreticalstudyoftheionosphericdynamoregioninsidethesouthatlanticanomaly AT xiaojunxu theoreticalstudyoftheionosphericdynamoregioninsidethesouthatlanticanomaly AT ziluzhou theoreticalstudyoftheionosphericdynamoregioninsidethesouthatlanticanomaly AT qingchang theoreticalstudyoftheionosphericdynamoregioninsidethesouthatlanticanomaly AT xingwang theoreticalstudyoftheionosphericdynamoregioninsidethesouthatlanticanomaly AT leiluo theoreticalstudyoftheionosphericdynamoregioninsidethesouthatlanticanomaly AT peishanhe theoreticalstudyoftheionosphericdynamoregioninsidethesouthatlanticanomaly AT huili theoreticalstudyoftheionosphericdynamoregioninsidethesouthatlanticanomaly |