Institution: | 1. Space Research Centre, Polish Academy of Sciences, Kopernika 11, 51-622, Wroc?aw, Poland 2. Earth Sciences Department, Natural History Museum, London, SW7 5BD, UK 3. Astronomical Institute, The Czech Academy of Sciences, 25165, Ond?ejov, Czech Republic 4. Institute of Terrestrial Magnetism and Radiowave Propagation (IZMIRAN), Troisk, Moscow, Russia
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