Using a Magnetohydrodynamic (MHD) Model to Simulate the Magnetospheric Response to a Kinetic Foreshock Transient
Abstract A global magnetohydrodynamic model predicts the response of the magnetosphere to the passage of a foreshock transient. We simulate the transient as an antisunward‐ and dawnward‐moving slab of hot tenuous solar wind plasma and weak magnetic field strengths on magnetic field lines connected t...
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| Format: | Article |
| Language: | English |
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Wiley
2025-03-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2024GL113463 |
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| author | D. G. Sibeck L. Rastätter M. El Alaoui |
| author_facet | D. G. Sibeck L. Rastätter M. El Alaoui |
| author_sort | D. G. Sibeck |
| collection | DOAJ |
| description | Abstract A global magnetohydrodynamic model predicts the response of the magnetosphere to the passage of a foreshock transient. We simulate the transient as an antisunward‐ and dawnward‐moving slab of hot tenuous solar wind plasma and weak magnetic field strengths on magnetic field lines connected to the bow shock. The slab elicits large‐amplitude outward bow shock motion with a stronger jump in plasma and magnetic field parameters on the trailing than the leading edges of this motion. The outward bulge in the bow shock bounds a magnetosheath region containing a hot tenuous plasma with weakened magnetic field strengths and flows deflected away from the Sun‐earth line. The magnetopause bulges outward into this magnetosheath region to distances beyond the nominal bow shock. Despite the large amplitude magnetopause motion, perturbations at geosynchronous orbit are miniscule. Model predictions compare well to the observed characteristics of foreshock transients and their effects on the magnetosphere. |
| format | Article |
| id | doaj-art-371495e958b644e1b0ffedf9bfcd43df |
| institution | OA Journals |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-371495e958b644e1b0ffedf9bfcd43df2025-08-20T02:27:05ZengWileyGeophysical Research Letters0094-82761944-80072025-03-01525n/an/a10.1029/2024GL113463Using a Magnetohydrodynamic (MHD) Model to Simulate the Magnetospheric Response to a Kinetic Foreshock TransientD. G. Sibeck0L. Rastätter1M. El Alaoui2NASA/GSFC Greenbelt MD USANASA/GSFC Greenbelt MD USACatholic University of America Washington DC USAAbstract A global magnetohydrodynamic model predicts the response of the magnetosphere to the passage of a foreshock transient. We simulate the transient as an antisunward‐ and dawnward‐moving slab of hot tenuous solar wind plasma and weak magnetic field strengths on magnetic field lines connected to the bow shock. The slab elicits large‐amplitude outward bow shock motion with a stronger jump in plasma and magnetic field parameters on the trailing than the leading edges of this motion. The outward bulge in the bow shock bounds a magnetosheath region containing a hot tenuous plasma with weakened magnetic field strengths and flows deflected away from the Sun‐earth line. The magnetopause bulges outward into this magnetosheath region to distances beyond the nominal bow shock. Despite the large amplitude magnetopause motion, perturbations at geosynchronous orbit are miniscule. Model predictions compare well to the observed characteristics of foreshock transients and their effects on the magnetosphere.https://doi.org/10.1029/2024GL113463bow shockmagnetosheathmagnetopause |
| spellingShingle | D. G. Sibeck L. Rastätter M. El Alaoui Using a Magnetohydrodynamic (MHD) Model to Simulate the Magnetospheric Response to a Kinetic Foreshock Transient Geophysical Research Letters bow shock magnetosheath magnetopause |
| title | Using a Magnetohydrodynamic (MHD) Model to Simulate the Magnetospheric Response to a Kinetic Foreshock Transient |
| title_full | Using a Magnetohydrodynamic (MHD) Model to Simulate the Magnetospheric Response to a Kinetic Foreshock Transient |
| title_fullStr | Using a Magnetohydrodynamic (MHD) Model to Simulate the Magnetospheric Response to a Kinetic Foreshock Transient |
| title_full_unstemmed | Using a Magnetohydrodynamic (MHD) Model to Simulate the Magnetospheric Response to a Kinetic Foreshock Transient |
| title_short | Using a Magnetohydrodynamic (MHD) Model to Simulate the Magnetospheric Response to a Kinetic Foreshock Transient |
| title_sort | using a magnetohydrodynamic mhd model to simulate the magnetospheric response to a kinetic foreshock transient |
| topic | bow shock magnetosheath magnetopause |
| url | https://doi.org/10.1029/2024GL113463 |
| work_keys_str_mv | AT dgsibeck usingamagnetohydrodynamicmhdmodeltosimulatethemagnetosphericresponsetoakineticforeshocktransient AT lrastatter usingamagnetohydrodynamicmhdmodeltosimulatethemagnetosphericresponsetoakineticforeshocktransient AT melalaoui usingamagnetohydrodynamicmhdmodeltosimulatethemagnetosphericresponsetoakineticforeshocktransient |