Open Access. The Published version of this work has been reproduced here in accordance with the Publisher’s self archiving and copyright policies.
Rights
This work was published in the Annales Geophysicae, 23 (3) 2005 p. 707-721 published by Copernicus Publications an Open Access Journal of the European Geosciences Union. All articles published in this journal may be freely reproduced for non-commercial, scientific purposes. However, reproduction, storage or translation for any other purposes requires prior permission from the European Geosciences Union. Please contact the Copernicus Publications Production Office for further information.