The Dynamics of a High Mach Number Quasi-Perpendicular Shock: MMS Observations
| Autor: | H. Madanian, Alexandra L. Brosius, Keiichi Ogasawara, O. Le Contel, Lynn B. Wilson, Robert E. Ergun, Narges Ahmadi, Christopher Russell, Mihir Desai, S. A. Fuselier, Drew Turner, Steven J. Schwartz, D. J. Gershman, Per-Arne Lindqvist, James L. Burch |
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| Přispěvatelé: | Southwest Research Institute [San Antonio] (SwRI), Laboratory for Atmospheric and Space Physics [Boulder] (LASP), University of Colorado [Boulder], NASA Goddard Space Flight Center (GSFC), Laboratoire de Physique des Plasmas (LPP), Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École polytechnique (X)-Sorbonne Université (SU)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Johns Hopkins University Applied Physics Laboratory [Laurel, MD] (APL), Department of Earth, Planetary and Space Sciences [Los Angeles] (EPSS), University of California [Los Angeles] (UCLA), University of California-University of California, Royal Institute of Technology [Stockholm] (KTH ) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
010504 meteorology & atmospheric sciences
[PHYS.ASTR.EP]Physics [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP] Astrophysics::High Energy Astrophysical Phenomena FOS: Physical sciences 01 natural sciences symbols.namesake Physics - Space Physics 0103 physical sciences Perpendicular Bow shock (aerodynamics) 010303 astronomy & astrophysics ComputingMilieux_MISCELLANEOUS Astrophysics::Galaxy Astrophysics 0105 earth and related environmental sciences Physics Spacecraft business.industry Astronomy and Astrophysics Space Physics (physics.space-ph) Physics - Plasma Physics Magnetic field Computational physics Shock (mechanics) Plasma Physics (physics.plasm-ph) Supernova Nonlinear system Mach number Space and Planetary Science Physics::Space Physics symbols business |
| Zdroj: | The Astrophysical Journal The Astrophysical Journal, American Astronomical Society, 2021, 908 (1), pp.40. ⟨10.3847/1538-4357/abcb88⟩ |
| ISSN: | 0004-637X 1538-4357 |
| DOI: | 10.3847/1538-4357/abcb88⟩ |
| Popis: | Shock parameters at Earth's bow shock in rare instances can approach the Mach numbers predicted at supernova remnants. We present our analysis of a high Alfv\'en Mach number ($M_A= 27$) shock utilizing multipoint measurements from the Magnetospheric Multiscale (MMS) spacecraft during a crossing of Earth's quasi-perpendicular bow shock. We find that the shock dynamics are mostly driven by reflected ions, perturbations that they generate, and nonlinear amplification of the perturbations. Our analyses show that reflected ions create modest magnetic enhancements upstream of the shock which evolve in a nonlinear manner as they traverse the shock foot. They can transform into proto-shocks that propagate at small angles to the magnetic field and towards the bow shock. The nonstationary bow shock shows signatures of both reformation and surface ripples. Our observations indicate that although shock reformation occurs, the main shock layer never disappears. These observations are at high plasma $\beta$, a parameter regime which has not been well explored by numerical models. Comment: Accepted by the Astrophysical Journal |
| Databáze: | OpenAIRE |
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