Torsional Alfvén Waves in a Dipolar Magnetic Field

Dr. Henri-Claude Nataf, ISTerre, Université Grenoble Alpes, CNRS, ISTerre, Grenoble, France, Zahia Tigrine, University Grenoble Alpes, ISTerre - CNRS/IRD, Grenoble, France; University of Science and Technology Houari Boumediene, Algiers, Algeria, Philippe Cardin, University Grenoble Alpes, ISTerre, Grenoble, France and Nathanaël Schaeffer, CNRS, ISTerre, Grenoble, France