Daily Dynamo Electric Fields Derived by Using Equatorial Ionization Anomaly Crests of the Total Electron Content
Abstract Latitudinal distances between the two equatorial ionization anomaly (EIA) crests in total electron content (TEC) of global ionosphere map (GIM) are used to derive the daily dynamo eastward electric field by comparing the eastward electric field calculated by ROCSAT‐1 vertical ion velocity i...
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| Format: | Article |
| Language: | English |
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Wiley
2022-11-01
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| Series: | Space Weather |
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| Online Access: | https://doi.org/10.1029/2022SW003073 |
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| author | Ching‐Chung Cheng Jann‐Yenq Liu Charles C. H. Lin Yin‐Chen Cheng |
| author_facet | Ching‐Chung Cheng Jann‐Yenq Liu Charles C. H. Lin Yin‐Chen Cheng |
| author_sort | Ching‐Chung Cheng |
| collection | DOAJ |
| description | Abstract Latitudinal distances between the two equatorial ionization anomaly (EIA) crests in total electron content (TEC) of global ionosphere map (GIM) are used to derive the daily dynamo eastward electric field by comparing the eastward electric field calculated by ROCSAT‐1 vertical ion velocity in four seasons. The electric fields derived by the EIA crests of GIM TEC, ROCSAT‐1 ion velocity, and the incoherent scatter radar (ISR) observations at Jicamarca are generally in good agreement in longitudes and seasons. Meanwhile, the electric fields derived by the EIA crests agree well with those by ROCSAT‐1, FORMOSAT‐7/COSMIC‐2, and Jicamarca ISR on individual days. A long‐term study of the GIM‐TEC crest distance reveals obvious solar activity dependency of the daily dynamo electric field during 1999–2020. These agreements confirm that the EIA crest can be used to derive the daily eastward dynamo electric field and the associated vertical ion velocity which is responsible to the strength of equatorial plasma fountain and the latitudinal extend of the EIA. Moreover, the vertical ion velocity derived by the GIM‐TEC crest distance is further used to improve the SAMI2 model for space weather applications. |
| format | Article |
| id | doaj-art-7d33c7e40c6c49dab5b0d923065b89e1 |
| institution | Kabale University |
| issn | 1542-7390 |
| language | English |
| publishDate | 2022-11-01 |
| publisher | Wiley |
| record_format | Article |
| series | Space Weather |
| spelling | doaj-art-7d33c7e40c6c49dab5b0d923065b89e12025-01-14T16:35:33ZengWileySpace Weather1542-73902022-11-012011n/an/a10.1029/2022SW003073Daily Dynamo Electric Fields Derived by Using Equatorial Ionization Anomaly Crests of the Total Electron ContentChing‐Chung Cheng0Jann‐Yenq Liu1Charles C. H. Lin2Yin‐Chen Cheng3Department of Space Science and Engineering National Central University Taoyuan TaiwanDepartment of Space Science and Engineering National Central University Taoyuan TaiwanDepartment of Earth Sciences National Cheng Kung University Tainan TaiwanDepartment of Earth Sciences National Cheng Kung University Tainan TaiwanAbstract Latitudinal distances between the two equatorial ionization anomaly (EIA) crests in total electron content (TEC) of global ionosphere map (GIM) are used to derive the daily dynamo eastward electric field by comparing the eastward electric field calculated by ROCSAT‐1 vertical ion velocity in four seasons. The electric fields derived by the EIA crests of GIM TEC, ROCSAT‐1 ion velocity, and the incoherent scatter radar (ISR) observations at Jicamarca are generally in good agreement in longitudes and seasons. Meanwhile, the electric fields derived by the EIA crests agree well with those by ROCSAT‐1, FORMOSAT‐7/COSMIC‐2, and Jicamarca ISR on individual days. A long‐term study of the GIM‐TEC crest distance reveals obvious solar activity dependency of the daily dynamo electric field during 1999–2020. These agreements confirm that the EIA crest can be used to derive the daily eastward dynamo electric field and the associated vertical ion velocity which is responsible to the strength of equatorial plasma fountain and the latitudinal extend of the EIA. Moreover, the vertical ion velocity derived by the GIM‐TEC crest distance is further used to improve the SAMI2 model for space weather applications.https://doi.org/10.1029/2022SW003073equatorial ionization anomaly latitudinal distancedaily eastward dynamo electric fieldROCSAT‐1Jicamarca incoherent scatter radarFORMOSAT‐7/COSMIC‐2 |
| spellingShingle | Ching‐Chung Cheng Jann‐Yenq Liu Charles C. H. Lin Yin‐Chen Cheng Daily Dynamo Electric Fields Derived by Using Equatorial Ionization Anomaly Crests of the Total Electron Content Space Weather equatorial ionization anomaly latitudinal distance daily eastward dynamo electric field ROCSAT‐1 Jicamarca incoherent scatter radar FORMOSAT‐7/COSMIC‐2 |
| title | Daily Dynamo Electric Fields Derived by Using Equatorial Ionization Anomaly Crests of the Total Electron Content |
| title_full | Daily Dynamo Electric Fields Derived by Using Equatorial Ionization Anomaly Crests of the Total Electron Content |
| title_fullStr | Daily Dynamo Electric Fields Derived by Using Equatorial Ionization Anomaly Crests of the Total Electron Content |
| title_full_unstemmed | Daily Dynamo Electric Fields Derived by Using Equatorial Ionization Anomaly Crests of the Total Electron Content |
| title_short | Daily Dynamo Electric Fields Derived by Using Equatorial Ionization Anomaly Crests of the Total Electron Content |
| title_sort | daily dynamo electric fields derived by using equatorial ionization anomaly crests of the total electron content |
| topic | equatorial ionization anomaly latitudinal distance daily eastward dynamo electric field ROCSAT‐1 Jicamarca incoherent scatter radar FORMOSAT‐7/COSMIC‐2 |
| url | https://doi.org/10.1029/2022SW003073 |
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