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Turbulence‐Driven Magnetic Reconnection in the Magnetosheath Downstream of a Quasi‐Parallel Shock: A Three‐Dimensional Global Hybrid Simulation
Author(s) -
Lu Quanming,
Wang Huanyu,
Wang Xueyi,
Lu San,
Wang Rongsheng,
Gao Xinliang,
Wang Shui
Publication year - 2020
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2019gl085661
Subject(s) - magnetosheath , physics , bow shock (aerodynamics) , magnetosphere , magnetic reconnection , bow wave , geophysics , current sheet , magnetopause , solar wind , shock wave , magnetic flux , shock (circulatory) , magnetohydrodynamics , mechanics , computational physics , astrophysics , magnetic field , medicine , quantum mechanics
Satellite observations with high‐resolution measurements have demonstrated the existence of intermittent current sheets and occurrence of magnetic reconnection in a quasi‐parallel magnetosheath behind the terrestrial bow shock. In this letter, by performing a three‐dimensional global hybrid simulation, we investigated the characteristics of the quasi‐parallel magnetosheath of the bow shock, which is formed due to the interaction of the solar wind with the Earth's magnetosphere. Current sheets with widths of several ion inertial lengths are found to be produced in the magnetosheath after the upstream large‐amplitude electromagnetic waves penetrate through the shock and are then compressed in the downstream. Magnetic reconnection consequently occurs in these current sheets, where high‐speed ion flow jets are identified in the outflow region. Simultaneously, flux ropes with the extension (along the y direction) of about several Earth's radii are also observed. Our simulation shed new insight on the mechanism for the occurrence of magnetic reconnection in the quasi‐parallel shocked magnetosheath.