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The role of intermediate shocks in magnetic reconnection
Author(s) -
Lin Y.,
Lee L. C.,
Kennel C. F.
Publication year - 1992
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 - 10.1029/91gl03008
Subject(s) - classification of discontinuities , current sheet , discontinuity (linguistics) , physics , magnetic field , magnetic reconnection , magnetohydrodynamics , current (fluid) , mechanics , plasma sheet , geophysics , magnetosphere , mathematical analysis , quantum mechanics , mathematics , thermodynamics
The structure of discontinuity layers associated with magnetic reconnection is studied by numerically solving the Riemann problem for the evolution of an initial current sheet, which separates two plasma regions with anti‐parallel magnetic field components in the z direction and a common guide magnetic field in the y direction. In the presence of a non‐zero normal component of magnetic field, B x , the initial current sheet evolves into a system of MHD discontinuities. For the initial current sheet with a zero guide field ( B y = 0), steady intermediate shocks, slow shocks, slow expansion waves, or contact discontinuity are observed to develop. However, for the current sheet with a non‐zero guide field ( B y ≠ 0), time‐dependent intermediate shocks (TDIS), instead of steady intermediate shocks, are observed to bound the reconnection layer. The magnetic fields across the TDIS are non‐coplanar and the width of the TDIS expands self‐similarly as The TDIS gradually evolves toward a rotational discontinuity.