Institution: | (1) Space Science Department of the European Space Agency, European Space Research and Technology Centre, Keplerlaan 1, 2200 AG Noordwijk, The Netherlands;(2) Istituto di Fisica Cosmica del CNR, Milan, Italy;(3) Istituto di Fisica dell'Uhiversità di Palermo, Italy;(4) Mallard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey, England |