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Current sheet formation and non-ideal behaviour at three-dimensional magnetic null points | | D. I. Pontin
; A. Bhattacharjee
; K. Galsgaard
; | | Date: |
16 Jan 2007 | | Abstract: | The nature of the evolution of the magnetic field, and of current sheet formation, at three-dimensional (3D) magnetic null points is investigated. A kinematic example is presented which demonstrates that there is no possible choice of boundary conditions which renders the evolution of the field ideal at the null, when the ratios of the null eigenvalues are time-dependent. Resistive MHD simulations are described which demonstrate that this evolution is generic. A 3D null is subjected to boundary driving by shearing motions, and it is shown that a current sheet localised at the null is formed. The qualitative and quantitative properties of the current sheet are discussed. Accompanying the sheet development is the growth of a localised parallel electric field, one of the signatures of magnetic reconnection. Finally, the relevance of the results to a recent theory of turbulent reconnection are discussed. | | Source: | arXiv, astro-ph/0701462 | | Services: | Forum | Review | PDF | Favorites | |
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