Physics – Plasma Physics
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991ppcn.proc...12b&link_type=abstract
In National Inst. for Fusion Science, Proceedings of the Second International Toki Conference on Plasma Physics and Controlled N
Physics
Plasma Physics
Current Sheets, Magnetic Field Reconnection, Plasma Control, Solar Corona, Solar Magnetic Field, Space Plasmas, Electrical Resistivity, Simulation, Stellar Models
Scientific paper
It is shown that a current sheet is formed in Parker's model of the solar corona (Parker 1972) from the requirement that magnetic helicity is conserved in the presence of a very small but finite plasma resistivity. The presence of dissipation permits slippage of field-lines with respect to the plasma, and makes Van Ballegooijen's theorem (1985) inapplicable. Thus, a current sheet can be formed in the presence of smooth photospheric flows. The structure of the current sheet encompasses a thin strip spanning two Y-points. It is shown that the rapid reconnection involved in the formation of the current sheet justifies the use of helicity conservation. Implications for coronal heating and numerical simulations of the corona are discussed.
Bhattacharjee Anirban
Wang Xiaogang
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