Institution: | Department of Physics and Astronomy, University of Catania, Via S. Sofia, 78-95123 Catania, Italy;IZMIRAN, Solar-Terrestrial Department, 142092 Moscow Region, Russia;National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China;Catania Astrophysical Observatory of the National Institute of Astrophysics, Via Santa Sofia, 78-95123 Catania, Italy |