Storm-Time Cusp Precipitation: Insights from TRACERS Multi-Crossing Observations
Fuente:
arXiv
Gespeichert in:
| Hauptverfasser: | , , , , , , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Veröffentlicht: |
2026
|
| Schlagworte: | |
| Online-Zugang: | |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| _version_ | 1866914615384866816 |
|---|---|
| author | Soni, Shirsh Lata Miles, David M. Halekas, Jasper Fuselier, Stephen A. Hospodarsky, George Øieroset, Marit Trattner, K. J. Petrinec, S. M. Faden, Jeremy Christopher, Ivar Pikar, Chris Henderson, Sarah A. Da Silva, Daniel Bounds, Scott Strangeway, Robert |
| author_facet | Soni, Shirsh Lata Miles, David M. Halekas, Jasper Fuselier, Stephen A. Hospodarsky, George Øieroset, Marit Trattner, K. J. Petrinec, S. M. Faden, Jeremy Christopher, Ivar Pikar, Chris Henderson, Sarah A. Da Silva, Daniel Bounds, Scott Strangeway, Robert |
| contents | The dayside cusp provides a direct pathway for solar wind plasma entry into the magnetosphere ionosphere system through magnetic reconnection. Using low altitude ion and electron measurements from TRACERS, together with upstream solar wind and geomagnetic conditions, we investigate the evolution of the cusp during a geomagnetic storm on 30 September 2025, spanning its rising, main, and recovery phases, and compare these with a quiet-time reference. Storm-time observations show broader and more poleward precipitation regions and enhanced electron energy flux, indicating intensified dayside coupling. To interpret these variations, we combine solar wind and IMF measurements with the maximum magnetic shear reconnection model to determine X-line locations and use a Tsyganenko field model to compute event-specific field-line transit distances between the X-line and TRACERS. The results demonstrate that cusp morphology and latitude track IMF-driven reconnection geometry, and that realistic path lengths are essential for quantitative reconnection-rate estimates, highlighting the capability of TRACERS to resolve storm-time cusp evolution. Enhanced cusp precipitation during the recovery phase is consistent with IMF conditions, indicating sustained solar wind driving rather than intrinsic storm-phase effects. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_30620 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Storm-Time Cusp Precipitation: Insights from TRACERS Multi-Crossing Observations Soni, Shirsh Lata Miles, David M. Halekas, Jasper Fuselier, Stephen A. Hospodarsky, George Øieroset, Marit Trattner, K. J. Petrinec, S. M. Faden, Jeremy Christopher, Ivar Pikar, Chris Henderson, Sarah A. Da Silva, Daniel Bounds, Scott Strangeway, Robert Space Physics The dayside cusp provides a direct pathway for solar wind plasma entry into the magnetosphere ionosphere system through magnetic reconnection. Using low altitude ion and electron measurements from TRACERS, together with upstream solar wind and geomagnetic conditions, we investigate the evolution of the cusp during a geomagnetic storm on 30 September 2025, spanning its rising, main, and recovery phases, and compare these with a quiet-time reference. Storm-time observations show broader and more poleward precipitation regions and enhanced electron energy flux, indicating intensified dayside coupling. To interpret these variations, we combine solar wind and IMF measurements with the maximum magnetic shear reconnection model to determine X-line locations and use a Tsyganenko field model to compute event-specific field-line transit distances between the X-line and TRACERS. The results demonstrate that cusp morphology and latitude track IMF-driven reconnection geometry, and that realistic path lengths are essential for quantitative reconnection-rate estimates, highlighting the capability of TRACERS to resolve storm-time cusp evolution. Enhanced cusp precipitation during the recovery phase is consistent with IMF conditions, indicating sustained solar wind driving rather than intrinsic storm-phase effects. |
| title | Storm-Time Cusp Precipitation: Insights from TRACERS Multi-Crossing Observations |
| topic | Space Physics |
| url | https://arxiv.org/abs/2605.30620 |