Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh33b0401i&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SH33B-0401
Astronomy and Astrophysics
Astrophysics
7500 Solar Physics, Astrophysics, And Astronomy, 7509 Corona, 7513 Coronal Mass Ejections (2101), 7531 Prominence Eruptions
Scientific paper
The solar filament eruption is a very important process for the formation of Coronal Mass Ejections. From a longtime argument, it is thought that the trigger mechanism is classified in the loss of stability and the loss of equilibrium. For instance, Priest & Forbes (1990) proposed a filament eruption model based on the loss-of-equilibrium theory. This model is that the flux tube embedded in a magnetic arcade may erupt as a consequence of that the equilibrium configuration is broken due to change the photospheric boundary condition. However, this model was two dimensional model which is assumed symmetry along the neutral line and not considered three dimensional process. The main objective of this paper is to study the 3D effects in a stability and the nonlinear dynamics of flux rope based on magnetohydrodynamic (MHD) simulation. As a result, we found that the flux tube proposed by Priest & Forbes is unstable to kink mode when the system approaches to the loss-of-equilibrium state. Our nonlinear simulation shows, that when the flux rope is long enough, it can escape from the arcade at almost constant speed after the accelerated launching phase due to the kink instability, whereas the short flux tube stops at certain height. It implies that there is the critical height that the flux tube must exceed and the chain process from the loss-of-stability to the loss-of- equilibrium should be important to develop the ejective eruptions based on the simulation results. Furthermore, we are going to report the results of simulation study on the role of magnetic reconnection and three- dimensional plasma density variation in magnetic flux erupting.
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