Physics
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsh21a..06c&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #SH21A-06
Physics
7513 Coronal Mass Ejections, 7524 Magnetic Fields, 7839 Nonlinear Phenomena, 7843 Numerical Simulation Studies
Scientific paper
Observations of CMEs show an apparent opening of a coronal magnetic field which has assumed a closed configuration before the eruption. In order for this transition of field configuration to occur spontaneously, the pre-eruption closed field must have more energy than the open field. However, as far as force-free fields are concerned, such a transition is energetically forbidden according to the Aly-Sturrock theorem. The theorem states that the maximum energy of the closed force-free fields with the same boundary-normal field distribution and the same field topology is the energy of the corresponding open field. The force-free fields treated in Aly and Sturrock's proofs of the theorem are force-free fields that can be generated from closed potential fields by footpoint motions conserving the boundary normal field distribution and the field topology. The force-free fields investigated in this paper are force-free fields which are not governed by Aly and Sturrock's proofs. We have constructed force-free fields in weak equilibrium, which can be generated in multiple flux systems by a footpoint motion not conserving the boundary normal field distribution. It is found that there exist force-free fields having more magnetic energy than the corresponding open fields. The relevance with observations and the possible mechanisms of CMEs will be discussed.
Cheng Chung-Chieh
Choe G.
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