The Emergence of a Twisted Ω-Tube into the Solar Atmosphere

Details The Emergence of a Twisted Ω-Tube into the Solar Atmosphere The Emergence of a Twisted Ω-Tube into the Solar Atmosphere

Jun 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001apj...554l.111f&link_type=abstract

The Astrophysical Journal, Volume 554, Issue 1, pp. L111-L114.

Astronomy and Astrophysics

Astronomy

121

Magnetohydrodynamics: Mhd, Sun: Magnetic Fields, Sun: Photosphere

Scientific paper

We report the results of a three-dimensional MHD simulation of the dynamic emergence of a twisted, Ω-shaped tube from the top layer of the solar convection zone into the atmosphere and the corona. It is found that the tube segment at the apex of the Ω-tube expands into the stably stratified atmosphere as a result of the magnetic buoyancy instability (or the Parker instability). Our simulation of the emergence of a left-hand-twisted Ω-tube reproduces several major observed features of a newly developing active region described by Strous and coworkers, including the orientation of the arch-filament system, the distribution of the vertical magnetic field on the photosphere, the locations of sunspot formation, and the organized shear flow pattern in the photospheric horizontal velocity field.

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