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- W1664751533 abstract "In the chain of physical processes leading to the origin and appearance of magnetic flux tubes in the Sun the following problems are considered: (1) Magnetic fragmentation of flux tubes in subphotospheric layers of the Sun; (2) Global instability of subphotospheric magnetic field and the origin of coronal transients; (3) Force-free twisted flux tubes in the corona. In the framework of magnetohydrodynamics with turbulent viscisity the problem of magnetic fragmentation of flux tubes reduces to the analysis of a dispersion equation. The characteristic scales of the flux tubes in the linear stage of the kink instability are evaluated for an isothermal plane-parallel atmosphere with constant Alfvenic velocity. For such an atmosphere in cylindrical geometry the differential equation describing the behaviour of the small perturbations of the subphotospheric toroidal magnetic field is obtained, the unstable character of which is connected with the origin of emerging magnetic flux tubes and coronal transients. For a description of the force-free magnetic field of twisted loops in the corona and interplanetary space we have utilized a quasi-cylindrical orthogonal coordinate system with an axis which models the curvature and twisting of the loop axis. For a toroidal configuration with an axis of constant curvature and zero twisting an equation is deduced which allows the solution for a force-free field at any order of the aspect ratio." @default.
- W1664751533 created "2016-06-24" @default.
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- W1664751533 date "1990-01-01" @default.
- W1664751533 modified "2023-10-16" @default.
- W1664751533 title "Magnetic flux tubes: Their origin and appearance" @default.
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- W1664751533 doi "https://doi.org/10.1029/gm058p0077" @default.
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