Hou, Chuanpeng; He, Jiansen; Duan, Die; Zhu, Xingyu; Li, Wenya; Verscharen, Daniel; Liu, Terry; Hou, Chuanpeng; He, Jiansen; Duan, Die; Zhu, Xingyu; Li, Wenya; Verscharen, Daniel; Liu, Terry; Wang, Tieyan; - view fewer (2023) Efficient Energy Conversion through Vortex Arrays in the Turbulent Magnetosheath. Astrophysical Journal , 946 (1) , Article 13. 10.3847/1538-4357/acb927.

Preview

Text Hou_2023_ApJ_946_13 (1).pdf - Published Version Download (2MB) | Preview

Abstract

Turbulence is often enhanced when transmitted through a collisionless plasma shock. We investigate how the enhanced turbulent energy in the Earth's magnetosheath effectively dissipates via vortex arrays. This research topic is of great importance as it relates to particle energization at astrophysical shocks across the universe. Wave modes and intermittent coherent structures are the key candidate mechanisms for energy conversion in turbulent plasmas. Here, by comparing in-situ measurements in the Earth's magnetosheath with a theoretical model, we find the existence of vortex arrays at the transition between the downstream regions of the Earth's bow shock. Vortex arrays consist of quasi-orthogonal kinetic waves and exhibit both high volumetric filling factors and strong local energy conversion, thereby showing a greater dissipative energization than traditional waves and coherent structures. Therefore, we propose that vortex arrays are a promising mechanism for efficient energy conversion in the sheath regions downstream of astrophysical shocks.

Download activity - last month

Export as XMLJSONCSV

Download activity - last 12 months

Export as CSVXMLJSON

Downloads by country - last 12 months

Export as JSONXMLCSV

Archive Staff Only

View Item