Quasi-equilibrium current sheet and the onset of impulsive bursty reconnection (CROSBI ID 645522)
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Podaci o odgovornosti
Skender, Marina
engleski
Quasi-equilibrium current sheet and the onset of impulsive bursty reconnection
A two-dimensional reconnecting current sheet is studied numerically in the magnetohydrodynamic approach. Different simulation setups are employed in order to follow the evolution of the formed current sheet in diverse configurations: two types of initial equilibria, Harris and force-free, two types of boundary conditions, periodic and open, with uniform and nonuniform grid set, respectively. All the simulated cases are found to exhibit qualitatively the same behavior in which a current sheet evolves slowly through a series of quasiequilibria ; eventually it fragments and enters a phase of fast impulsive bursty reconnection. In order to gain more insight on the nature and characteristics of the instability taking place, physical characteristics of the simulated current sheet are related to its geometrical properties. At the adopted Lundquist number of S =104 and Reynolds number R =104, the ratio of the length to width (aspect ratio) of the formed current sheet is observed to increase slowly in time up to a maximum value at which it fragments. Moreover, additional turbulence applied to the system is shown to exhibit the same qualitative steps, but with the sooner onset of the fragmentation and at smaller aspect ratio.
quasiequlibrium current sheet, impulsive bursty reconnection, tearing-mode instability, aspect ratio
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Podaci o prilogu
2010.
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Podaci o matičnoj publikaciji
Podaci o skupu
SOTERIA General Meeting
predavanje
18.01.2010-20.01.2010
Davos, Švicarska