Does the Dayside Equatorial Ionospheric Electric Field Respond to Isolated Substorms?
Abstract Substorms are known to induce global magnetosphere‐ionosphere coupling. However, the specific response of the dayside ionospheric electric field and its influence on the equatorial electrojet (EEJ) remain controversial. This study investigates the electromagnetic field response in the daysi...
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| Format: | Article |
| Language: | English |
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Wiley
2025-05-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2025GL115227 |
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| author | M. Hayashi A. Yoshikawa S. Ohtani |
| author_facet | M. Hayashi A. Yoshikawa S. Ohtani |
| author_sort | M. Hayashi |
| collection | DOAJ |
| description | Abstract Substorms are known to induce global magnetosphere‐ionosphere coupling. However, the specific response of the dayside ionospheric electric field and its influence on the equatorial electrojet (EEJ) remain controversial. This study investigates the electromagnetic field response in the dayside equatorial region during isolated substorms using ground magnetic field data. Statistical analysis revealed that the H component decreased at equatorial and low‐latitude stations during isolated substorms. These decreases were of similar magnitude on average, indicating that significant changes in the EEJ caused by penetrating electric fields were not observed. However, individual events showed slight positive and negative variations. These results suggest that substorm‐associated electric fields can reach equatorial regions, but additional conditions determine the positive and negative variations. This finding provides new insights into the spatial extent of substorm‐induced electric fields. |
| format | Article |
| id | doaj-art-2e164fd40f434ad7a51a8862f860905b |
| institution | DOAJ |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2025-05-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-2e164fd40f434ad7a51a8862f860905b2025-08-20T03:10:31ZengWileyGeophysical Research Letters0094-82761944-80072025-05-015210n/an/a10.1029/2025GL115227Does the Dayside Equatorial Ionospheric Electric Field Respond to Isolated Substorms?M. Hayashi0A. Yoshikawa1S. Ohtani2Department of Earth and Planetary Sciences Graduate School of Science Kyushu University Fukuoka JapanDepartment of Earth and Planetary Sciences Faculty of Science Kyushu University Fukuoka JapanJohns Hopkins University Applied Physics Laboratory Laurel MD USAAbstract Substorms are known to induce global magnetosphere‐ionosphere coupling. However, the specific response of the dayside ionospheric electric field and its influence on the equatorial electrojet (EEJ) remain controversial. This study investigates the electromagnetic field response in the dayside equatorial region during isolated substorms using ground magnetic field data. Statistical analysis revealed that the H component decreased at equatorial and low‐latitude stations during isolated substorms. These decreases were of similar magnitude on average, indicating that significant changes in the EEJ caused by penetrating electric fields were not observed. However, individual events showed slight positive and negative variations. These results suggest that substorm‐associated electric fields can reach equatorial regions, but additional conditions determine the positive and negative variations. This finding provides new insights into the spatial extent of substorm‐induced electric fields.https://doi.org/10.1029/2025GL115227substormionosphereequatormagnetosphere |
| spellingShingle | M. Hayashi A. Yoshikawa S. Ohtani Does the Dayside Equatorial Ionospheric Electric Field Respond to Isolated Substorms? Geophysical Research Letters substorm ionosphere equator magnetosphere |
| title | Does the Dayside Equatorial Ionospheric Electric Field Respond to Isolated Substorms? |
| title_full | Does the Dayside Equatorial Ionospheric Electric Field Respond to Isolated Substorms? |
| title_fullStr | Does the Dayside Equatorial Ionospheric Electric Field Respond to Isolated Substorms? |
| title_full_unstemmed | Does the Dayside Equatorial Ionospheric Electric Field Respond to Isolated Substorms? |
| title_short | Does the Dayside Equatorial Ionospheric Electric Field Respond to Isolated Substorms? |
| title_sort | does the dayside equatorial ionospheric electric field respond to isolated substorms |
| topic | substorm ionosphere equator magnetosphere |
| url | https://doi.org/10.1029/2025GL115227 |
| work_keys_str_mv | AT mhayashi doesthedaysideequatorialionosphericelectricfieldrespondtoisolatedsubstorms AT ayoshikawa doesthedaysideequatorialionosphericelectricfieldrespondtoisolatedsubstorms AT sohtani doesthedaysideequatorialionosphericelectricfieldrespondtoisolatedsubstorms |