Institution: | 1. Space Research Institute, Austrian Academy of Sciences, Schmiedlstrasse 6, 8042 Graz, Austria;2. Institute of Physics, University of Graz, Universitätsplatz 5, 8010 Graz, Austria;3. Institute of Physics, State University St. Petersburg, 198504, Russia;4. INAF, Osservatorio Astronomico di Palermo, Piazza del Parlamento 1, I-90134 Palermo, Italy |