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| Titel |
Study on Switch-off Magnetic Reconnection Due to the Parallel Shear Flow |
| VerfasserIn |
Haoyu Lu, Jinbin Cao |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250049448
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| Zusammenfassung |
| Magnetic reconnections take place in many regions in space. In the process of magnetic
reconnection, magnetic energy stored in the magnetic field is converted into the plasma
kinetic energy rapidly. Usually, magnetic reconnection takes place at the current
sheet that separates two plasma regions which have anti-parallel magnetic field
components. A layered plasma structure composed of MHD discontinuities and expansion
waves is formed in the outflow region.This layered plasma structure is called the
reconnection layer. In this paper, the development of the structure of symmetric
and asymmetric reconnection layer in the presence of a shear flow parallel to the
anti-parallel magnetic field component is studied by using a set of one-dimensional (1D)
magnetohydrodynamic (MHD) equations. The Riemann problem is simulated through a
second-order conservative TVD scheme, in conjunction with Roe’s averages for the Riemann
problem.
The simulation results indicate that besides the MHD shocks and expansion waves, there
exist some new small-scale structures in the reconnection layer. The capturing of these
small scale structures depicts that the numerical method used has high resolution
and accuracy. For the case of zero initial guide magnetic field (i.e., By0=0), a pair
of intermediate shock (IS) and slow shock (SS) is formed in the presence of the
parallel shear flow. The critical velocity of initial shear flow V zc is just the Alfven
velocity in the inflow region. As V z-increases to the value larger thanV zc, a new
slow expansion wave (SE) appears in the position of SS in the case V z- |
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