Creation of current sheets in sheared force-free fields and two-ribbon solar flares

Details Creation of current sheets in sheared force-free fields and two-ribbon solar flares Creation of current sheets in sheared force-free fields and two-ribbon solar flares

Aug 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983icrc....4....2a&link_type=abstract

IN: International Cosmic Ray Conference, 18th, Bangalore, India, August 22-September 3, 1983, Conference Papers. Volume 4 (A85-2

Other

Current Sheets, Solar Corona, Solar Flares, Asymptotic Methods, Free Energy, Half Spaces, Photosphere, Solar Wind

Scientific paper

It is shown that a two-dimensional force-free field in the half-space (Z greater than 0) approaches asymptotically an open structure, with all the current concentrated in an infinitesimally thin sheet, when the feet of its lines on (Z = 0) are idenfinitely sheared and perfect conductivity of the plasma is assumed. The result is used to suggest a model for a two-ribbon flare. In this model, the coronal force-free field is brought by the photospheric motions into a quasi-open configuration, which then becomes unstable to the development of a tearing mode. A large scale reconnection process is then initiated, during which the stored magnetic free energy is released and converted into other forms.

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