1. Institute for Particle Physics and Astrophysics, Physics Department , ETH Zürich, Wolfgang-Pauli Strasse 27, Zürich 8093 , Switzerland
2. Center of Space Research and Technology, Academy of Athens , 4, Soranou Efesiou str., 11527 Papagos, Athens , Greece
3. Institute of Earth Sciences, Ruprecht-Karls-Universität Heidelberg , Im Neuenheimer Feld 234-236, D-69120 Heidelberg , Germany
4. Institute Space Systems (IRS), University Stuttgart , Pfaffenwaldring 29, D-69168 Stuttgart , Germany
5. Department of Physics and Astronomy, University of Missouri , Columbia, MO 65211 , USA
6. Institute of Experimental and Applied Physics (IEAP), Faculty of Mathematics and Natural Sciences, Christian-Albrechts-University of Kiel , Leibnizstrasse 11-19, D-24118 Kiel , Germany
7. Physics Institute, University of Bern , CH-3012 Bern , Switzerland
8. Applied Physics Laboratory, The Johns Hopkins University , Laurel, MD 20723 , USA
9. Institute of Geochemistry and Petrology, Department of Earth Sciences , ETH Zürich, Clausiusstrasse 25, CH-8092 Zürich , Switzerland
10. Department of Physics and Astronomy, University of Canterbury , Christchurch, 8020 , New Zealand
11. Institut de Recherche en Astrophysique et Planétologie (IRAP) , 9 Av. du Colonel Roche, F-31400 Toulouse , France
12. Space Research Centre, Polish Academy of Sciences , Warsaw 00-716 , Poland
13. Institute for Theoretical Physics IV, Chair for Space and Astrophysics, Ruhr-Universität Bochum , D-44780 Bochum , Germany
14. Bay Area Environmental Research Institute, NASA Research Park , Moffett Field, CA 94035 , USA
15. Center for Theoretical Astrophysics, Departments of Astronomy and Physics, University of Illinois , Urbana, IL 61801 , USA
16. University of Chicago, Astronomy and Astrophysics Center , 5640 S Ellis Ave, Chicago, IL 60637 , USA
17. Laboratory for Atmospheric and Space Physics, University of Colorado , Boulder, CO 80303 , USA
18. Institute of Geological Sciences, Freie Universität Berlin , D-12249 Berlin , Germany
19. Max-Planck-Institut für Sonnensystemforschung , Justus-von-Liebig-Weg 3, D-37077 Göttingen , Germany
20. Department of Physics and Astronomy, University of Iowa , Iowa City, Iowa, IA 52242 , USA
21. JILA, University of Colorado , Boulder, CO 80305-0440 , USA
22. Astrophysical and Planetary Sciences Department, University of Colorado Boulder, CO 80305 , USA
23. Astronomy Department, Boston University , Cambridge, Massachusetts, MA 02215 , USA
24. Space Sciences Laboratory, University of California at Berkeley , Berkeley, CA 94720 , USA
25. Astronomy Department, Van Vleck Observatory 101, Wesleyan University , 96 Foss Hill Drive, Middletown, CT 06459 , USA
26. MIT Kavli Inst. for Astroph. and Sp. Res. , 77 Massachusetts Avenue, McNair Building (MIT Building 37), Cambridge, MA 02139 , USA
27. Astrophysics Group, Imperial College London , Prince Consort Rd, London SW7 2BZ , UK
28. Department of Astrophysical Sciences, Princeton University , Princeton, NJ 08544 , USA
29. Center for Astrophysics, High Energy Astrophysics Division , Harvard and Smithsonian, 60 Garden Street, MS 04, Cambridge, MA 02138-1516 , USA
30. Institute of Applied Physics, University of Bern , Sidlerstrasse 5, 3012 Bern , Switzerland
31. Oeschger Center for Climate Change Research, University of Bern , Hochschulstrasse 4, 3012 Bern , Switzerland