Variational principle for slender flux tubes. I. General equations and added mass effects. J/A+A/313/1008 J/A+A/313/1008 Slender flux tubes variational principle . I. Variational principle for slender flux tubes. I. General equations and added mass effects. A Achterberg Astron. Astrophys. 313 1008 1996 1996A&A...313.1008A Magnetic fields Sun magnetic fields MHD Sun: magnetic fields The equation of motion governing slender flux tubes is derived using a variational principle. I consider the interaction between the tube and its surroundings due to buoyancy, added mass (anisotropic inertia) and hydrodynamic drag. It is pointed out that the application of the simple added mass formula commonly used in the litterature is in fact limited to the case of an unstratified, non-rotating flow.
appen.texLaTeX version of appendix Patricia Bauer CDS 1996May23Bram Achterberg <A.Achterberg@fys.ruu.nl> J_A+A_313_1008.xml