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Unveiling the 3D Structure of Magnetosheath Jets
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  • Shahab Fatemi,
  • Maria Hamrin,
  • Eva Krämer,
  • Herbert Gunell,
  • Gabriella Nordin,
  • Tomas Karlsson,
  • Oleksandr Goncharov
Shahab Fatemi
Department of Physics at Umeå University

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Maria Hamrin
Umeå University
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Eva Krämer
Umeå University
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Herbert Gunell
Umeå University
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Gabriella Nordin
Umeå University
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Tomas Karlsson
KTH Royal Institute of Technology
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Oleksandr Goncharov
Charles University in Prague
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Abstract

Magnetosheath jets represent localized enhancements in dynamic pressure observed within the magnetosheath. These energetic entities, carrying excess energy and momentum, can impact the magnetopause and disrupt the magnetosphere. Therefore, they play a vital role in coupling the solar wind and terrestrial magnetosphere. However, our understanding of the morphology and formation of these complex, transient events remains incomplete over two decades after their initial observation. Previous studies have relied on oversimplified assumptions, considering jets as elongated cylinders with dimensions ranging from 0.1RE to 5.0RE (Earth radii). In this study, we present simulation results obtained from Amitis, a high-performance hybrid-kinetic plasma framework (particle ions and fluid electrons) running in parallel on Graphics Processing Units (GPUs) for fast and more environmentally friendly computation compared to CPU-based models. Considering realistic scales, we present the first global, three-dimensional (3D in both configuration and velocity spaces) hybrid-kinetic simulation results of the interaction between solar wind plasma and Earth. Our high-resolution kinetic simulations reveal the 3D structure of magnetosheath jets, showing that jets are far from being simple cylinders. Instead, they exhibit intricate and highly interconnected structures with dynamic 3D characteristics. As they move through the magnetosheath, they wrinkle, fold, merge, and split in complex ways before a subset reaches the magnetopause.
02 Mar 2024Submitted to ESS Open Archive
04 Mar 2024Published in ESS Open Archive