Non-Current-free Coronal Closure of Subphotospheric MHD Models

Details Non-Current-free Coronal Closure of Subphotospheric MHD Models Non-Current-free Coronal Closure of Subphotospheric MHD Models

Aug 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005apj...629l..37a&link_type=abstract

The Astrophysical Journal, Volume 629, Issue 1, pp. L37-L40.

Astronomy and Astrophysics

Astronomy

16

Magnetohydrodynamics: Mhd, Stars: Coronae, Stars: Flare, Stars: Magnetic Fields

Scientific paper

We propose a method that allows the matching of two classes of models that have been well developed so far, but largely independently from each other: (1) convection zone (CZ) models, which generally either end up below the photosphere or are matched with an external potential field, and (2) coronal models of eruptive processes and heating, which usually consider the evolution of current-carrying magnetic fields driven by given photospheric changes. In our approach, the thin turbulent photospheric layer between the two large regions is modeled as a resistive layer across which the physical quantities suffer stiff variations. We show that this layer enables the transport of an electric current into the corona through the tangential component of the electric field (continuous across the various interfaces), as well as good conservation of the global magnetic helicity. To illustrate our general approach, we present in detail a model problem in which the rising of an initially twisted flux rope through the CZ is described kinematically while the physics inside the corona is described by a full magnetohydrodynamic model. We show that the evolution leads to the emergence of magnetic flux and electric current into the corona, with the creation of a flux rope that eventually suffers a dynamical transition toward fast expansion.

Affiliated with

Also associated with

No associations

Rating

Non-Current-free Coronal Closure of Subphotospheric MHD Models 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 Non-Current-free Coronal Closure of Subphotospheric MHD Models, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Non-Current-free Coronal Closure of Subphotospheric MHD Models will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1347102