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Astron. Astrophys. 352, L79-L82 (1999)

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Letter to the Editor

3D simulations of twisted magnetic flux ropes

S.B.F. Dorch 1, V. Archontis 2 and Å. Nordlund 2

1 The Royal Swedish Academy of Sciences, Stockholm Observatory, 13336 Saltsjöbaden, Sweden
2 The Niels Bohr Institute for Astronomy, Physics and Geophysics, Juliane Maries Vej 30, 2100 Copenhagen O, Denmark

Received 6 April 1999 / Accepted 3 November 1999


Several numerical simulations of buoyant 2D and 3D twisted flux ropes have been performed. It is found that the apex region of an anchored 3D flux rope behaves similarly to the simpler case of a 2D horizontal twisted flux tube while the overall structure of such a 3D flux rope developes quite differently. Upon emergence a characteristic S-shape of the magnetic field lines is displayed in agreement with observations in soft X-ray.

Key words: instabilities – magnetic fields – Magnetohydrodynamics (MHD) – Sun: activity – Sun: magnetic fields – Sun: sunspots

Send offprint requests to: S.B.F. Dorch (dorch@astro.su.se)

© European Southern Observatory (ESO) 1999

Online publication: December 2, 1999