Institution: | (1) Space Science Department of the European Space Agency, European Space Research and Technology Centre, Keplerlaan 1, 2200 AG Noordwijk, The Netherlands;(2) Space Sciences Laboratory, Lockheed Palo Alto Research Laboratory, Palo Alto, California, USA;(3) Mallard Space Science Laboratory, Department of Physics and Astronomy, University College London, Holmbury St. Mary, Dorking, Surrey, England |