1. Max-Planck-Institut für extraterrestrische Physik , Postfach 1312, Giessenbachstr., D-85748 Garching, Germany
2. Universitäs-Sternwarte Müchen , Scheinerstrasse 1, D-81679 Müchen, Germany
3. Department of Astronomy, University of Florida , 211 Bryant Space Science Center, Gainesville, FL 32611, USA
4. Argelander Fellow, Argelander Institut für Astronomie der Universität Bonn , Auf dem Hügel 71, D-53121 Bonn, Germany
5. Institute of Space Sciences (ICE , CSIC), Campus UAB, Carrer de Can Magrans, s/n, E-08193 Barcelona, Spain
6. Institut d’Estudis Espacials de Catalunya (IEEC) , E-08034 Barcelona, Spain
7. Institute of Physics, Laboratory of Astrophysics, École Polytechnique Fédérale de Lausanne (EPFL), Observatoire de Sauverny , CH-1290 Versoix, Switzerland
8. Department of Physics and Astronomy, University of Utah , 115 S. 1400 E., Salt Lake City, UT 84112, USA
9. Department of Physics and Astronomy, Sejong University , Seoul, 143-747, Republic of Korea
10. Department of Astronomy and Astrophysics, The Pennsylvania State University , University Park, PA 16802, USA
11. Institute for Gravitation and the Cosmos, The Pennsylvania State University , University Park, PA 16802, USA