Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh31b..01w&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SH31B-01
Physics
7513 Coronal Mass Ejections (2101), 7519 Flares, 7524 Magnetic Fields, 7529 Photosphere
Scientific paper
Free magnetic energy, equivalent to departures of the coronal magnetic field from the potential field (its unique minimum energy state), is thought to drive CMEs. Non- potentiality is manifested in the coronal field by filaments and sigmoids, and in the photospheric field by magnetic shear. Observations of eruptions, and pre- and post-eruptive magnetic fields, illustrate typical properties of eruptive field configurations. Photospheric shearing flows, magnetic flux emergence, and magnetic flux cancellation (via reconnection) are three mechanisms that have been proposed to increase free magnetic energy in the corona. Reviewing observations of non- potentiality and its evolution in eruptive configurations, as well as simulations of these free energy injection mechanisms, I conclude that: 1) all three mechanisms are probably at work (a circumstance I consider unfortunate!); 2) while photospheric shear flows and magnetic flux emergence are significant sources of non-potentiality, they are inconsistent with observations of some eruptive configurations; and 3) magnetic flux cancellation does not possess the same shortcomings, and is therefore probably primarily responsible for increasing coronal free energy leading to CMEs.
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