Ballooning instability and oscillations of coronal loops

Details Ballooning instability and oscillations of coronal loops Ballooning instability and oscillations of coronal loops

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006arep...50.1026t&link_type=abstract

Astronomy Reports, Volume 50, Issue 12, pp.1026-1035

Astronomy and Astrophysics

Astronomy

2

96.60.Pf, 96.60.Hv, 95.30.Qd

Scientific paper

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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