The stability of line tied force-free cylindrical arcades: Is an active region filament a requirement for a two-ribbon flare? |
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| Authors: | A Hood U Anzer |
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| Institution: | (1) Department of Applied Mathematics, St. Andrews university, St. Andrews, Scotland;(2) Max-Planck-Institut für Astrophysik, 8046 Garching bei München, F.R.G. |
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| Abstract: | The MHD stability of force-free, cylindrical arcades is investigated, including the stabilising effect of photospheric line tying. It is found that a wide variety of fields are stable. This suggests that either a departure from a force free equilibrium or suppression of line tying is necessary if a two-ribbon flare is to be triggered. It is postulated that in both circumstances, the existence of an active region filament is an essential preflare requirement for a two-ribbon flare. |
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