On discontinuous plasma flows in the vicinity of reconnecting current sheets in solar flares |
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Authors: | L S Ledentsov B V Somov |
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Institution: | 1.Moscow State University,Moscow,Russia;2.Sternberg Astronomical Institute,Moscow,Russia |
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Abstract: | The question about the interpretation of numerical experiments on magnetic reconnection in solar flares is considered. A correspondence
between the standard classification of magnetohydrodynamic discontinuities and the parameters characterizing the mass flux
through a discontinuity and the magnetic field configuration has been established within a classical formulation of the problem
on discontinuous magnetohydrodynamic flows. A pictorial graphical representation of the relationship between the angles of
the magnetic field vector relative to the normal to the discontinuity plane on both its sides has also been found. The relations
between the parameters of a two-dimensional discontinuous flow have the simplest form in a frame of reference where the magnetic
field lines (B) are parallel to the matter velocity (u)—the deHoffmann-Teller frame. The question about the transformation of the magnetic field configuration when passing to a
“laboratory” frame of reference where (v · B) ≠ 0, i.e., an electric field is present, is considered in this connection. The result is applied to the analytical solution
of the problem on the magnetic field structure in the vicinity of a reconnecting current sheet obtained previously by Bezrodnykh
et al. The regions of nonevolutionary shocks are shown to appear near the endpoints of a current sheet with reverse currents. |
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