Statistical Study of Magnetosheath Jet‐Driven Bow Waves
| Autor: | Vassilis Angelopoulos, Rami Vainio, Ferdinand Plaschke, Yuri Omelchenko, Terry Z. Liu, Heli Hietala |
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| Přispěvatelé: | The Royal Society |
| Rok vydání: | 2020 |
| Předmět: |
Physics
010504 meteorology & atmospheric sciences Shock (fluid dynamics) Astrophysics::High Energy Astrophysical Phenomena FOS: Physical sciences 01 natural sciences Space Physics (physics.space-ph) Computational physics Particle acceleration Solar wind symbols.namesake Geophysics Magnetosheath Physics - Space Physics Mach number Space and Planetary Science Bow wave 0201 Astronomical and Space Sciences Physics::Space Physics symbols 0401 Atmospheric Sciences Bow shock (aerodynamics) Interplanetary magnetic field Astrophysics::Galaxy Astrophysics 0105 earth and related environmental sciences |
| Zdroj: | Journal of Geophysical Research: Space Physics. 125 |
| ISSN: | 2169-9402 2169-9380 |
| DOI: | 10.1029/2019ja027710 |
| Popis: | When a magnetosheath jet (localized dynamic pressure enhancements) compresses ambient magnetosheath at a (relative) speed faster than the local magnetosonic speed, a bow wave or shock can form ahead of the jet. Such bow waves or shocks were recently observed to accelerate particles, thus contributing to magnetosheath heating and particle acceleration in the extended environment of Earth bow shock. To further understand the characteristics of jet-driven bow waves, we perform a statistical study to examine which solar wind conditions favor their formation and whether it is common for them to accelerate particles. We identified 364 out of 2859 (13%) magnetosheath jets to have a bow wave or shock ahead of them with Mach number typically larger than 1.1. We show that large solar wind plasma beta, weak interplanetary magnetic field (IMF) strength, large solar wind Alfven Mach number, and strong solar wind dynamic pressure present favorable conditions for their formation. We also show that magnetosheath jets with bow waves or shocks are more frequently associated with higher maximum ion and electron energies than those without them, confirming that it is common for these structures to accelerate particles. In particular, magnetosheath jets with bow waves have electron energy flux enhanced on average by a factor of 2 compared to both those without bow waves and the ambient magnetosheath. Our study implies that magnetosheath jets can contribute to shock acceleration of particles especially for high Mach number shocks. Therefore, shock models should be generalized to include magnetosheath jets and concomitant particle acceleration. Under review by JGR space physics |
| Databáze: | OpenAIRE |
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