Physics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsh44a1728t&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SH44A-1728
Physics
2723 Magnetic Reconnection (7526, 7835), 7513 Coronal Mass Ejections (2101), 7519 Flares, 7526 Magnetic Reconnection (2723, 7835), 7835 Magnetic Reconnection (2723, 7526)
Scientific paper
A quantitative description of three-dimensional (3D) magnetic reconnection still remains a challenge. This is because the variety of 3D structural features, where reconnection may occur in magnetic configurations, is much wider than in 2D case. And, what is particularly important, some of them, for example, quasi-separatrix layers, do not provide an exact partition of configurations on distinct magnetic fluxes, which makes it difficult to identify in this process the reconnected flux itself. Nevertheless, Hesse et al. (2005, ApJ 631) have recently shown that the latter is possible if the electric field parallel to magnetic field is known at the reconnecting flux tubes. We present here an alternative method for describing magnetic reconnection based solely on the field-line mapping technique that has recently been formulated in its most general form by Titov (2007, ApJ 660). We extend this technique from the analysis of magnetic structure at a given moment to the analysis of its evolution by introducing a new quantity called comparative squashing factor Qc. The large values of Qc define the magnetic surfaces enclosing the reconnected flux. The proposed method is universal in the sense that it assumes only the evolution of magnetic field and boundary flows to be known. This method admits also a straightforward numerical implementation, which allows one to develop an efficient diagnostics of the reconnection process in numerical simulations of realistic 3D magnetic configurations. Work supported by NASA and the Center for Integrated Space Weather Modeling (an NSF Science and Technology Center).
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