MHD modeling of the double-gradient (kink) magnetic instability
نویسندگان
چکیده
منابع مشابه
On the nature of kink MHD waves in magnetic flux tubes
Context. Magnetohydrodynamic (MHD) waves are often reported in the solar atmosphere and usually classified as slow, fast, or Alfvén. The possibility that these waves have mixed properties is often ignored. Aims. The goal of this work is to study and determine the nature of MHD kink waves. Methods. This is done by calculating the frequency, the damping rate and the eigenfunctions of MHD kink wav...
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We study the equilibria of a self-gravitating scalar field in the region outside a reflecting barrier. By introducing a potential difference between the barrier and infinity, we create a kink which cannot decay to a zero-energy state. In the realm of a small amplitude, the kink decays to a known static solution of the Einstein-Klein-Gordon equation. However, for larger kinks the static equilibr...
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We study dynamical consequences of the kink instability of a twisted coronal flux rope, using the force-free coronal loop model by Titov & Démoulin (1999) as the initial condition in ideal-MHD simulations. When a critical value of the twist is exceeded, the long-wavelength (m=1) kink mode develops. Analogous to the well-known cylindrical approximation, a helical current sheet is then formed at ...
متن کاملTwisted Coronal Magnetic Loops and the Kink Instability in Solar Eruptions
c © 2003 by John von Neumann Institute for Computing Permission to make digital or hard copies of portions of this work for personal or classroom use is granted provided that the copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. To copy otherwise requires prior specific permission by the publisher ment...
متن کاملThe Mhd Kelvin-helmholtz Instability Iii: the Role of Sheared Magnetic Field in Planar Flows
We have carried out simulations of the nonlinear evolution of the magnetohydrodynamic (MHD) Kelvin-Helmholtz (KH) instability for compressible fluids in 2 1 2 -dimensions, extending our previous work by Frank et al. (1996) and Jones et al. (1997). In the present work we have simulated flows in the x− y plane in which a “sheared” magnetic field of uniform strength “smoothly” rotates across a thi...
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ژورنال
عنوان ژورنال: Journal of Geophysical Research: Space Physics
سال: 2013
ISSN: 2169-9380
DOI: 10.1002/jgra.50206