Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...466l..39a&link_type=abstract
Astrophysical Journal Letters v.466, p.L39
Astronomy and Astrophysics
Astronomy
66
Magnetohydrodynamics: Mhd, Stars: Coronae, Stars: Magnetic Fields, Stars: Flare
Scientific paper
This Letter is devoted to the still open problem of the evolution of a three-dimensional coronal flux tube embedded in a low-beta ideal plasma and having its footpoints twisted by slow photospheric motions. Such a process has been simulated with a recently developed magnetohydrodynamic code. In the particular calculation reported here, the system occupies a large cubic box. The field is initially potential, being generated by an underlying horizontal dipole, and it is twisted by two vortices located on the lower face {z = 0} of the box, on both sides of the neutral line. In a first phase, the field roughly evolves quasi-statically through a sequence of force-free configurations. Thus, it enters a dynamical phase during which it suffers a very fast expansion, closely approaching after some finite time a semi-open configuration. The energy increases monotonically during all the evolution, and it tends to a limit, which is equal to about 80% of the energy of the totally open field associated with Bz.
Aly Jean-Jacques
Amari Tahar
Luciani J. F.
Tagger Michel
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