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M. André and A. Eriksson, se) I Avenue de la Recherche Scientifique, F-45071 Orléans Cedex 2, France. (pdecreau@cnrs-orleans.fr) A. Fazakerley, Department of Physics (anf@mssl.ucl.ac.uk) P.-A. Lindqvist, Division of Plasma Physics, Alfven Laboratory, Royal Institute of Technology, S-10044 Stockholm, Sweden. (lindqvist@ plasma.kth.se) B. Lybekk and A. Pedersen, Swedish Institute of Space Physicsno) A. Masson and M. (fmozer@ssl.berkeley.edu) G. Paschmann, MPI fur Extraterrestrische Physik, Giessenbachstrasse, D-85748 Garching, Germany. (goetz.paschmann@mpe.mpg.de) K. R. Svenes, Division of Electronics Kjeller, Norway. (knut.svenes@ffi.no) K. Torkar, Space Research Institute, Austrian Academy of Sciences, p.8042