Daytime F Region Echoes at Equatorial Ionization Anomaly Crest During Geomagnetic Quiet Period: Observations From Multi‐Instruments
Abstract By using Qujing very high frequency radar (25.6°N, 103.7°E, magnetic latitude 16.1°N, magnetic longitude 177.0°E), daytime F region echoes were reported at equatorial ionization anomaly crest on 26 June 2020. Radar interferometry experiment was performed during the observation period. The o...
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| Format: | Article |
| Language: | English |
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Wiley
2022-03-01
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| Series: | Space Weather |
| Online Access: | https://doi.org/10.1029/2021SW003002 |
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| author | Yi Liu Zhongxin Deng Tong Xu Jian Kong Chen Zhou Yibin Yao Qiong Tang Zhengyu Zhao |
| author_facet | Yi Liu Zhongxin Deng Tong Xu Jian Kong Chen Zhou Yibin Yao Qiong Tang Zhengyu Zhao |
| author_sort | Yi Liu |
| collection | DOAJ |
| description | Abstract By using Qujing very high frequency radar (25.6°N, 103.7°E, magnetic latitude 16.1°N, magnetic longitude 177.0°E), daytime F region echoes were reported at equatorial ionization anomaly crest on 26 June 2020. Radar interferometry experiment was performed during the observation period. The observed results show that the spatial distributions of daytime F region echo pattern were about 150 km, 200 km, and 180 km in the zonal, meridional, and height extents, respectively. In addition, we observed a remarkable eastward drift of F region echoes with a mean velocity of about 50 m/s. To investigate the possible generation mechanism of daytime F region echoes, simultaneous occurrences of ionospheric disturbance and atmospheric gravity wave activities were presented by combining with the observations of ionosonde, global position system stations and FY‐4A satellite. The existence of gravity wave from the deep convective activities in the lower atmosphere was confirmed by using FY‐4A satellite measurements. The gravity wave signatures were also observed in the time series of virtual height deviations of sporadic E (dhES) and total electron content near the region where the F region echoes. We surmise that ionospheric disturbance in the F region could be excited during atmospheric gravity wave activities. Then the large‐scale ionospheric disturbance could further evolve into small‐scale irregularity producing radar echoes through the non‐linear cascade process. |
| format | Article |
| id | doaj-art-0b13505d15fb4c57960c7dba1e61133f |
| institution | Kabale University |
| issn | 1542-7390 |
| language | English |
| publishDate | 2022-03-01 |
| publisher | Wiley |
| record_format | Article |
| series | Space Weather |
| spelling | doaj-art-0b13505d15fb4c57960c7dba1e61133f2025-01-14T16:30:57ZengWileySpace Weather1542-73902022-03-01203n/an/a10.1029/2021SW003002Daytime F Region Echoes at Equatorial Ionization Anomaly Crest During Geomagnetic Quiet Period: Observations From Multi‐InstrumentsYi Liu0Zhongxin Deng1Tong Xu2Jian Kong3Chen Zhou4Yibin Yao5Qiong Tang6Zhengyu Zhao7Department of Space Physics School of Electronic Information Wuhan University Wuhan ChinaNational Key Laboratory of Electromagnetic Environment China Research Institute of Radiowave Propagation Qingdao ChinaNational Key Laboratory of Electromagnetic Environment China Research Institute of Radiowave Propagation Qingdao ChinaChinese Antarctic Center of Surveying and Mapping Wuhan University Wuhan ChinaDepartment of Space Physics School of Electronic Information Wuhan University Wuhan ChinaSchool of Geodesy and Geomatics Wuhan University Wuhan ChinaInstitute of Space Science and Applied Technology Harbin Institute of Technology Shenzhen ChinaInstitute of Space Science and Applied Technology Harbin Institute of Technology Shenzhen ChinaAbstract By using Qujing very high frequency radar (25.6°N, 103.7°E, magnetic latitude 16.1°N, magnetic longitude 177.0°E), daytime F region echoes were reported at equatorial ionization anomaly crest on 26 June 2020. Radar interferometry experiment was performed during the observation period. The observed results show that the spatial distributions of daytime F region echo pattern were about 150 km, 200 km, and 180 km in the zonal, meridional, and height extents, respectively. In addition, we observed a remarkable eastward drift of F region echoes with a mean velocity of about 50 m/s. To investigate the possible generation mechanism of daytime F region echoes, simultaneous occurrences of ionospheric disturbance and atmospheric gravity wave activities were presented by combining with the observations of ionosonde, global position system stations and FY‐4A satellite. The existence of gravity wave from the deep convective activities in the lower atmosphere was confirmed by using FY‐4A satellite measurements. The gravity wave signatures were also observed in the time series of virtual height deviations of sporadic E (dhES) and total electron content near the region where the F region echoes. We surmise that ionospheric disturbance in the F region could be excited during atmospheric gravity wave activities. Then the large‐scale ionospheric disturbance could further evolve into small‐scale irregularity producing radar echoes through the non‐linear cascade process.https://doi.org/10.1029/2021SW003002 |
| spellingShingle | Yi Liu Zhongxin Deng Tong Xu Jian Kong Chen Zhou Yibin Yao Qiong Tang Zhengyu Zhao Daytime F Region Echoes at Equatorial Ionization Anomaly Crest During Geomagnetic Quiet Period: Observations From Multi‐Instruments Space Weather |
| title | Daytime F Region Echoes at Equatorial Ionization Anomaly Crest During Geomagnetic Quiet Period: Observations From Multi‐Instruments |
| title_full | Daytime F Region Echoes at Equatorial Ionization Anomaly Crest During Geomagnetic Quiet Period: Observations From Multi‐Instruments |
| title_fullStr | Daytime F Region Echoes at Equatorial Ionization Anomaly Crest During Geomagnetic Quiet Period: Observations From Multi‐Instruments |
| title_full_unstemmed | Daytime F Region Echoes at Equatorial Ionization Anomaly Crest During Geomagnetic Quiet Period: Observations From Multi‐Instruments |
| title_short | Daytime F Region Echoes at Equatorial Ionization Anomaly Crest During Geomagnetic Quiet Period: Observations From Multi‐Instruments |
| title_sort | daytime f region echoes at equatorial ionization anomaly crest during geomagnetic quiet period observations from multi instruments |
| url | https://doi.org/10.1029/2021SW003002 |
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