Institution: | 1.International Space Science Institute, Hallerstrasse 6, 3012, Bern, Switzerland ;2.Institute of Physics, University of Ume?, S-90187, Ume?, Sweden ;3.University of Maryland, 3114B CSS Space Physics, College Park, MD, 20742, USA ;4.Max-Planck-Institut fur extraterrestrische Physik, D-85740, Garching, Germany ;5.Applied Physics Laboratory, The Johns Hopkins University, Johns Hopkins Road, Laurel, MD, 20723, USA ; |