Ballooning instability and oscillations of coronal loops |
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Authors: | Yu T Tsap Yu G Kopylova A V Stepanov |
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Institution: | (1) Crimean Astrophysical Observatory, National Academy of Sciences of Ukraine, p/o Nauchnyĭ, Crimea, 334413, Ukraine;(2) Pulkovo Observatory, Russian Academy of Sciences, Pulkovskoe shosse 65, St. Petersburg, 196140, Russia |
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Abstract: | The excitation of the ballooning instability by the eigenoscillations of coronal loops is analyzed using the energy method. The second variation of the potential energy for the case of a plasma—plasma boundary is obtained via the linearized ideal MHD equations. It is shown that the eigenmodes of a magnetic tube and of a toroidal coronal loop coincide in a first approximation. The bending oscillations of the loops are able to excite the ballooning instability when β ? 1. The effects of the instability in solar coronal loops are discussed. |
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