Eastward Transients in the Dayside Ionosphere II: A Parallel-plate Capacitor-Like Effect
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arXiv
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2025
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| author | Ivarsen, Magnus F St-Maurice, Jean-Pierre Hussey, Glenn C McWilliams, Kathryn Jin, Yaqi Huyghebaert, Devin R Miyashita, Yukinaga Sibeck, David |
| author_facet | Ivarsen, Magnus F St-Maurice, Jean-Pierre Hussey, Glenn C McWilliams, Kathryn Jin, Yaqi Huyghebaert, Devin R Miyashita, Yukinaga Sibeck, David |
| contents | During the 23 April 2023 geospace storm, we observed chorus wave-driven, energetic particle precipitation on closed magnetic field lines in the dayside magnetosphere. Simultaneously and in the ionosphere's bottom-side, we observed signatures of impact ionization and strong enhancements in the ionospheric electric field, via radar-detection of meter-scale turbulence, and with matching temporal characteristics as that of the magnetospheric observations. We detailed this in a companion paper. In the present article, we place those observations into context with the dayside ionosphere, and describe a remarkably similar event that took place during the May 2024 geospace superstorm. In both cases, fast, eastward-moving electric field structures were excited equatorward of the ionospheric cusp, on closed magnetic field-lines -- observations that challenge existing modes of explanation for electrodynamics in the cusp-region, where most such observations are interpreted in the context of poleward-moving auroral forms. Instead, primarily eastward-moving electric field structures were associated with turbulent Hall currents that are perhaps characteristically excited during geospace storms by wave-particle interactions near magnetospheric equator or by proton precipitation characteristics in the cusp, forming a `parallel-plate capacitor-like effect'. We propose that transient eastward electrodynamic bursts in the dayside ionosphere might be a common, albeit previously unresolved, feature of geomagnetic storms. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_03174 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Eastward Transients in the Dayside Ionosphere II: A Parallel-plate Capacitor-Like Effect Ivarsen, Magnus F St-Maurice, Jean-Pierre Hussey, Glenn C McWilliams, Kathryn Jin, Yaqi Huyghebaert, Devin R Miyashita, Yukinaga Sibeck, David Space Physics Earth and Planetary Astrophysics Geophysics During the 23 April 2023 geospace storm, we observed chorus wave-driven, energetic particle precipitation on closed magnetic field lines in the dayside magnetosphere. Simultaneously and in the ionosphere's bottom-side, we observed signatures of impact ionization and strong enhancements in the ionospheric electric field, via radar-detection of meter-scale turbulence, and with matching temporal characteristics as that of the magnetospheric observations. We detailed this in a companion paper. In the present article, we place those observations into context with the dayside ionosphere, and describe a remarkably similar event that took place during the May 2024 geospace superstorm. In both cases, fast, eastward-moving electric field structures were excited equatorward of the ionospheric cusp, on closed magnetic field-lines -- observations that challenge existing modes of explanation for electrodynamics in the cusp-region, where most such observations are interpreted in the context of poleward-moving auroral forms. Instead, primarily eastward-moving electric field structures were associated with turbulent Hall currents that are perhaps characteristically excited during geospace storms by wave-particle interactions near magnetospheric equator or by proton precipitation characteristics in the cusp, forming a `parallel-plate capacitor-like effect'. We propose that transient eastward electrodynamic bursts in the dayside ionosphere might be a common, albeit previously unresolved, feature of geomagnetic storms. |
| title | Eastward Transients in the Dayside Ionosphere II: A Parallel-plate Capacitor-Like Effect |
| topic | Space Physics Earth and Planetary Astrophysics Geophysics |
| url | https://arxiv.org/abs/2501.03174 |