Torsional Alfvén Waves in a Dipolar Magnetic Field

Henri-Claude Nataf1, Zahia Tigrine1,2, Philippe Cardin1 and Nathanaël Schaeffer1, (1)University Grenoble Alpes, ISTerre - CNRS/IRD, Grenoble, France, (2)University of Science and Technology Houari Boumediene, Algiers, Algeria