Indications and implications of twisted magnetic flux in the corona

Details Indications and implications of twisted magnetic flux in the corona Indications and implications of twisted magnetic flux in the corona

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsh52a0446g&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SH52A-0446

Statistics

Computation

7509 Corona, 7513 Coronal Mass Ejections, 7519 Flares, 7524 Magnetic Fields, 7531 Prominence Eruptions

Scientific paper

The question of whether magnetic flux ropes are fundamental to CMEs and their precursors will be addressed using a combination of analytic and numerical models, along with coronal observations. We have developed computational tools for evaluating observable properties of modeled magnetic flux ropes suspended in the corona, such as separatrix surfaces and dipped magnetic fields. We have also developed numerical models to demonstrate how a flux rope emerging into an overlying coronal magnetic arcade will relax to a force-free configuration, with associated formation of current sheets. Using the results of these two parallel studies, we will directly compare separatrix surfaces determined from an analytic (non-force-free) equilibrium model to the current sheets formed during numerical force-free relaxation of the same initial field configuration. We will then consider these in the context of observed X-ray sigmoid structures. We have also developed mathematical methods for determining the magnetic free energy in analytic models of both magnetic flux ropes, as well as sheared field configurations that contain no rope. We will compare the free energies thus determined for both sheared and twisted fields, as functions of spatial size, magnetic field strength, and degree of shear or twist. We will consider the implications of these results for the energetics of coronal mass ejections.

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