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Generation Mechanism for Interlinked Flux Tubes on the Magnetopause
Author(s) -
Farinas Perez G.,
Cardoso F. R.,
Sibeck D.,
Gonzalez W. D.,
Facskó G.,
Coxon J. C.,
Pembroke A. D.
Publication year - 2018
Publication title -
journal of geophysical research: space physics
Language(s) - English
Resource type - Journals
eISSN - 2169-9402
pISSN - 2169-9380
DOI - 10.1002/2017ja024664
Subject(s) - magnetopause , physics , magnetic reconnection , magnetic flux , flux (metallurgy) , interplanetary magnetic field , magnetic field , rope , magnetohydrodynamics , instability , solar wind , geophysics , mechanics , chemistry , organic chemistry , structural engineering , quantum mechanics , engineering
We use a global magnetohydrodynamics simulation to analyze transient magnetic reconnection processes at the magnetopause. The solar wind conditions have been kept constant, and an interplanetary magnetic field with large duskward B Y and southward B Z components has been imposed. Five flux transfer events (FTEs) with clear bipolar magnetic field signatures have been observed. We observed a peculiar structure defined as interlinked flux tubes (IFTs) in the first and fourth FTE, which had very different generation mechanisms. The first FTE originates as an IFTs and remains with this configuration until its final moment. However, the fourth FTE develops as a classical flux rope but changes its 3‐D magnetic configuration to that of IFTs. This work studies the mechanism for generating IFTs. The growth of the resistive tearing instability has been identified as the cause for the first IFTs formation. We believe that the instability has been triggered by the accumulation of interplanetary magnetic field at the subsolar point where the grid resolution is very high. The evidence shows that two new reconnection lines form northward and southward of the subsolar region. The IFTs have been generated with all the classical signatures of a single flux rope. The other IFTs detected in the fourth FTE developed as a result of magnetic reconnection inside its complex and twisted magnetic fields, which leads to a change in the magnetic configuration from a flux rope of twisted magnetic field lines to IFTs.