Substorm Impact on Dayside Ionospheric Currents
Abstract Ionospheric dayside dynamics is strongly controlled by the interaction between the Interplanetary Magnetic Field (IMF) and the Earth's magnetic field near the dayside magnetopause, while nightside ionospheric dynamics depends mainly on magnetotail activity. However, we know little abou...
Saved in:
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2023-07-01
|
| Series: | Geophysical Research Letters |
| Online Access: | https://doi.org/10.1029/2023GL104800 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1850201736021540864 |
|---|---|
| author | R. Elhawary K. M. Laundal J. P. Reistad M. Madelaire A. Ohma |
| author_facet | R. Elhawary K. M. Laundal J. P. Reistad M. Madelaire A. Ohma |
| author_sort | R. Elhawary |
| collection | DOAJ |
| description | Abstract Ionospheric dayside dynamics is strongly controlled by the interaction between the Interplanetary Magnetic Field (IMF) and the Earth's magnetic field near the dayside magnetopause, while nightside ionospheric dynamics depends mainly on magnetotail activity. However, we know little about the influence of magnetotail activity on the dayside ionospheric dynamics. We investigate this by performing superposed epoch analyses of ground magnetic field data for substorms occurring during northward IMF. In such substorms, dayside reconnection is minimized, allowing us to separate the effects of the magnetotail activity on the dayside current system. We find that as nightside activity elevates, the dayside ionospheric current elevates. Our analyses indicate that the lobe cells are less distinct before onset than during non‐substorm northward IMF conditions. They become more pronounced after onset, possibly due to magnetospheric reconfiguration or a remote effect of the nightside current. We discuss possible mechanisms that may explain our observations. |
| format | Article |
| id | doaj-art-5fbc097ddb934ca296f4ff13b9434534 |
| institution | OA Journals |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2023-07-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-5fbc097ddb934ca296f4ff13b94345342025-08-20T02:11:57ZengWileyGeophysical Research Letters0094-82761944-80072023-07-015014n/an/a10.1029/2023GL104800Substorm Impact on Dayside Ionospheric CurrentsR. Elhawary0K. M. Laundal1J. P. Reistad2M. Madelaire3A. Ohma4Birkeland Centre for Space Science Department for Physics and Technology University of Bergen Bergen NorwayBirkeland Centre for Space Science Department for Physics and Technology University of Bergen Bergen NorwayBirkeland Centre for Space Science Department for Physics and Technology University of Bergen Bergen NorwayBirkeland Centre for Space Science Department for Physics and Technology University of Bergen Bergen NorwayBirkeland Centre for Space Science Department for Physics and Technology University of Bergen Bergen NorwayAbstract Ionospheric dayside dynamics is strongly controlled by the interaction between the Interplanetary Magnetic Field (IMF) and the Earth's magnetic field near the dayside magnetopause, while nightside ionospheric dynamics depends mainly on magnetotail activity. However, we know little about the influence of magnetotail activity on the dayside ionospheric dynamics. We investigate this by performing superposed epoch analyses of ground magnetic field data for substorms occurring during northward IMF. In such substorms, dayside reconnection is minimized, allowing us to separate the effects of the magnetotail activity on the dayside current system. We find that as nightside activity elevates, the dayside ionospheric current elevates. Our analyses indicate that the lobe cells are less distinct before onset than during non‐substorm northward IMF conditions. They become more pronounced after onset, possibly due to magnetospheric reconfiguration or a remote effect of the nightside current. We discuss possible mechanisms that may explain our observations.https://doi.org/10.1029/2023GL104800 |
| spellingShingle | R. Elhawary K. M. Laundal J. P. Reistad M. Madelaire A. Ohma Substorm Impact on Dayside Ionospheric Currents Geophysical Research Letters |
| title | Substorm Impact on Dayside Ionospheric Currents |
| title_full | Substorm Impact on Dayside Ionospheric Currents |
| title_fullStr | Substorm Impact on Dayside Ionospheric Currents |
| title_full_unstemmed | Substorm Impact on Dayside Ionospheric Currents |
| title_short | Substorm Impact on Dayside Ionospheric Currents |
| title_sort | substorm impact on dayside ionospheric currents |
| url | https://doi.org/10.1029/2023GL104800 |
| work_keys_str_mv | AT relhawary substormimpactondaysideionosphericcurrents AT kmlaundal substormimpactondaysideionosphericcurrents AT jpreistad substormimpactondaysideionosphericcurrents AT mmadelaire substormimpactondaysideionosphericcurrents AT aohma substormimpactondaysideionosphericcurrents |