Ionospheric Disturbances Over the Indian Sector During 8 September 2017 Geomagnetic Storm: Plasma Structuring and Propagation
Abstract The series of X and M class flares and associated coronal mass ejections that occurred on the first days of September 2017 induced significant perturbations on the low‐latitude ionospheric electrodynamics. On 8 September in the Indian sector, the storm caused a severe modification of the eq...
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| Format: | Article |
| Language: | English |
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Wiley
2021-03-01
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| Series: | Space Weather |
| Online Access: | https://doi.org/10.1029/2020SW002607 |
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| author | L. Alfonsi C. Cesaroni L. Spogli M. Regi A. Paul S. Ray S. Lepidi D. Di Mauro H. Haralambous C. Oikonomou P. R. Shreedevi A. K. Sinha |
| author_facet | L. Alfonsi C. Cesaroni L. Spogli M. Regi A. Paul S. Ray S. Lepidi D. Di Mauro H. Haralambous C. Oikonomou P. R. Shreedevi A. K. Sinha |
| author_sort | L. Alfonsi |
| collection | DOAJ |
| description | Abstract The series of X and M class flares and associated coronal mass ejections that occurred on the first days of September 2017 induced significant perturbations on the low‐latitude ionospheric electrodynamics. On 8 September in the Indian sector, the storm caused a severe modification of the equatorial electrojet (EEJ) with a consequent variation of the ionospheric structuring and dynamics. In our analysis, we propose an original method to isolate and identify EEJ variations from geomagnetic data and we detect the presence of equatorial plasma bubbles (EPB) from L‐band total electron content (TEC) data in order to understand their movement. Our results provide evidence of independent EPBs appearance freshly generated and inherited from a migrating plasma structure. The EPB (or EPBs) occurring in the south of India is/are freshly generated just above the magnetic equator, and is/are likely triggered by the sudden increase of EEJ just before the local sunset, acting as a pre‐reversal enhancement. The EPB appearing in the North‐East Indian region is associated with a migrating structure, resulting in a northward movement with a velocity of about 650 m/s, possibly testifying the passage of a large‐scale traveling ionospheric disturbance. The occurrence of severe post‐sunset scintillations in the northeastern sector suggests a possible cascade process forming small‐scale irregularities from the migrating EPB. |
| format | Article |
| id | doaj-art-8c26e9fc614a4b1192471811e58bded2 |
| institution | Kabale University |
| issn | 1542-7390 |
| language | English |
| publishDate | 2021-03-01 |
| publisher | Wiley |
| record_format | Article |
| series | Space Weather |
| spelling | doaj-art-8c26e9fc614a4b1192471811e58bded22025-01-14T16:30:38ZengWileySpace Weather1542-73902021-03-01193n/an/a10.1029/2020SW002607Ionospheric Disturbances Over the Indian Sector During 8 September 2017 Geomagnetic Storm: Plasma Structuring and PropagationL. Alfonsi0C. Cesaroni1L. Spogli2M. Regi3A. Paul4S. Ray5S. Lepidi6D. Di Mauro7H. Haralambous8C. Oikonomou9P. R. Shreedevi10A. K. Sinha11Istituto Nazionale di Geofisica e Vulcanologia Rome ItalyIstituto Nazionale di Geofisica e Vulcanologia Rome ItalyIstituto Nazionale di Geofisica e Vulcanologia Rome ItalyIstituto Nazionale di Geofisica e Vulcanologia Rome ItalyInstitute of Radio Physics and Electronics University of Calcutta IndiaInstitute of Radio Physics and Electronics University of Calcutta IndiaIstituto Nazionale di Geofisica e Vulcanologia Rome ItalyIstituto Nazionale di Geofisica e Vulcanologia Rome ItalyElectrical Engineering Department Frederick University Nicosia CyprusElectrical Engineering Department Frederick University Nicosia CyprusSchool of Space and Environment Beihang University Beijing ChinaIndian Institute of Geomagnetism Navi Mumbai IndiaAbstract The series of X and M class flares and associated coronal mass ejections that occurred on the first days of September 2017 induced significant perturbations on the low‐latitude ionospheric electrodynamics. On 8 September in the Indian sector, the storm caused a severe modification of the equatorial electrojet (EEJ) with a consequent variation of the ionospheric structuring and dynamics. In our analysis, we propose an original method to isolate and identify EEJ variations from geomagnetic data and we detect the presence of equatorial plasma bubbles (EPB) from L‐band total electron content (TEC) data in order to understand their movement. Our results provide evidence of independent EPBs appearance freshly generated and inherited from a migrating plasma structure. The EPB (or EPBs) occurring in the south of India is/are freshly generated just above the magnetic equator, and is/are likely triggered by the sudden increase of EEJ just before the local sunset, acting as a pre‐reversal enhancement. The EPB appearing in the North‐East Indian region is associated with a migrating structure, resulting in a northward movement with a velocity of about 650 m/s, possibly testifying the passage of a large‐scale traveling ionospheric disturbance. The occurrence of severe post‐sunset scintillations in the northeastern sector suggests a possible cascade process forming small‐scale irregularities from the migrating EPB.https://doi.org/10.1029/2020SW002607 |
| spellingShingle | L. Alfonsi C. Cesaroni L. Spogli M. Regi A. Paul S. Ray S. Lepidi D. Di Mauro H. Haralambous C. Oikonomou P. R. Shreedevi A. K. Sinha Ionospheric Disturbances Over the Indian Sector During 8 September 2017 Geomagnetic Storm: Plasma Structuring and Propagation Space Weather |
| title | Ionospheric Disturbances Over the Indian Sector During 8 September 2017 Geomagnetic Storm: Plasma Structuring and Propagation |
| title_full | Ionospheric Disturbances Over the Indian Sector During 8 September 2017 Geomagnetic Storm: Plasma Structuring and Propagation |
| title_fullStr | Ionospheric Disturbances Over the Indian Sector During 8 September 2017 Geomagnetic Storm: Plasma Structuring and Propagation |
| title_full_unstemmed | Ionospheric Disturbances Over the Indian Sector During 8 September 2017 Geomagnetic Storm: Plasma Structuring and Propagation |
| title_short | Ionospheric Disturbances Over the Indian Sector During 8 September 2017 Geomagnetic Storm: Plasma Structuring and Propagation |
| title_sort | ionospheric disturbances over the indian sector during 8 september 2017 geomagnetic storm plasma structuring and propagation |
| url | https://doi.org/10.1029/2020SW002607 |
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