The author expresses his cordial thanks to Dr. Valera Nakariakov, Dr. Michael Ruderman, Prof. Bernard Roberts and Prof. Efim Pelinovsky for stimulating discussions. This work was financially supported by the State Committee for Scientific Research in Poland, KBN grant no. 2 PO3D 017 17. The numerical simulations have been performed on an Sun workstation at the Institute of Physics, UMCS Lublin and on a SGI power station at the Poznan Supercomputing Center.
© European Southern Observatory (ESO) 2000
Online publication: August 17, 2000