Pre-eruption Magnetic Field Configurations with High Magnetic Energy Storage

Details Pre-eruption Magnetic Field Configurations with High Magnetic Energy Storage Pre-eruption Magnetic Field Configurations with High Magnetic Energy Storage

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsh42b0514c&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SH42B-0514

Physics

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

Scientific paper

Previously it was believed that the energy of a force-free field cannot exceed the energy of the corresponding open field. This proposition was established as the Aly-Sturrock Theorem. According to this theorem, the energy budget for coronal mass ejections (CMEs) and eruptive flares is very tight. Magnetograms and soft X-ray observations before solar eruptive events often indicate that the pre-eruption magnetic fields consist of multiple flux systems. We construct numerical solutions of force-free magnetic fields in multiple flux systems and investigate their eruption energetics. Our study of multiple flux systems shows that there can be many classes of force-free fields having more energy than the open fields. The energy of an interwinding two-flux system is found to exceed the open field energy for a winding angle near 360 degrees. Comparison of the numerically constructed solutions with observations of active eruption regions also reveals that the eruption indeed takes place for a winding angle slightly larger than 360 degrees. The dynamic evolution from high energy equilibria will be discussed based on 3D MHD simulations.

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