Stuttgart 2012 – wissenschaftliches Programm
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SYGP: Symposium Gemeinsame Probleme in Fusions- und astrophysikalischen Plasmen
SYGP 2: Posters
SYGP 2.5: Poster
Montag, 12. März 2012, 16:00–16:30, Poster.V
(contribution withdrawn) Fragmentation of current sheets and vortex sheets in stationary incompressible MHD — •Dieter H. Nickeler1,2, Marian Karlicky1, Miroslav Barta1, and Thomas Wiegelmann2 — 1Astronomical Institute Ondrejov, 25165 Ondrejov, Czech Republic — 2MPS, Katlenburg-Lindau, Germany
Fragmentation of current sheets and vortex sheets is an important process connected with eruptive space plasma processe, including magnetic reconnection. Slow changes of magnetic structures in the solar atmosphere and planetary magnetospheres by variation of boundary conditions or other external parameters lead often to the formation of current and vortex sheets. These current or vortex sheets can trigger micro-instabilities, which cause resistivity or viscosity on fluid scales. Consequently resistive instabilities like magnetic reconnection can occur and the systems evolves dynamically. The notion of quasi-magnetohydrostatic evolution can explain the quasi-static phase of many space plasma before an eruption occurs. Examples are eruptive flares, coronal mass ejections and magnetospheric substorms. Within this investigation we use the theory of (quasi-)steady MHD by including nonlinear, stationary plasma flows and show how stationary plasma flows along the magnetic field lines can also be responsible for the existence or generation of fragmentation of current and vortex sheets.