Eruption of a helically twisted prominence

Details Eruption of a helically twisted prominence Eruption of a helically twisted prominence

Jun 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003soph..214..313r&link_type=abstract

Solar Physics, v. 214, Issue 2, p. 313-323 (2003).

Physics

23

Scientific paper

In this paper we analyze the eruption of a prominence, characterized by a helical-like structure and by a non-linear rising motion. We approximated the prominence as a cylindrical curved flux tube and estimated the behaviour of several geometrical parameters during the activation and the eruption phases. We determined that, at the onset of the activation, the number N of turns of a magnetic field line over the whole length of the prominence was ~5.0, while the value of the ratio P/r0 between the pitch of the magnetic field lines and the prominence width was ~0.45. These values are in good agreement with those predicted by the kink-mode instability. Moreover, we found a decrease of the total twist of one helical thread from Φ~10π to Φ~2π during the prominence eruption, indicating a relaxation of the magnetic field towards a less twisted configuration. We conclude that the prominence was initially destabilized by the kink-mode instability and, not succeeding in finding a new equilibrium configuration, it erupted.

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