Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009apj...701.1911p&link_type=abstract
The Astrophysical Journal, Volume 701, Issue 2, pp. 1911-1921 (2009).
Astronomy and Astrophysics
Astronomy
11
Methods: Numerical, Mhd, Sun: Magnetic Fields, Sun: Photosphere, Sun: Uv Radiation
Scientific paper
The increase of magnetic flux in the solar atmosphere during active-region formation involves the transport of the magnetic field from the solar convection zone through the lowest layers of the solar atmosphere, through which the plasma β changes from >1 to <1 with altitude. The crossing of this magnetic transition zone requires the magnetic field to adopt a serpentine shape also known as the sea-serpent topology. In the frame of the resistive flux-emergence model, the rising of the magnetic flux is believed to be dynamically driven by a succession of magnetic reconnections which are commonly observed in emerging flux regions as Ellerman bombs. Using a data-driven, three-dimensional (3D) magnetohydrodynamic numerical simulation of flux emergence occurring in active region 10191 on 2002 November 16-17, we study the development of 3D electric current sheets. We show that these currents buildup along the 3D serpentine magnetic-field structure as a result of photospheric diverging horizontal line-tied motions that emulate the observed photospheric evolution. We observe that reconnection can not only develop following a pinching evolution of the serpentine field line, as usually assumed in two-dimensional geometry, but can also result from 3D shearing deformation of the magnetic structure. In addition, we report for the first time on the observation in the UV domain with the Transition Region and Coronal Explorer (TRACE) of extremely transient loop-like features, appearing within the emerging flux domain, which link several Ellermam bombs with one another. We argue that these loop transients can be explained as a consequence of the currents that build up along the serpentine magnetic field.
Aulanier Guillaume
Masson Sophie
Pariat Etienne
No associations
LandOfFree
Current Buildup in Emerging Serpentine Flux Tubes does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Current Buildup in Emerging Serpentine Flux Tubes, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Current Buildup in Emerging Serpentine Flux Tubes will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1314529