1. Research Centre for Astronomy and Earth Sciences, GGI; Hungarian Academy of Sciences; Sopron Hungary
2. Baja Observatory of the University of Szeged; Baja Hungary
3. Department of Electronics; AGH University of Science and Technology; Krakow Poland
4. Department of Space Physics, station Nýdek, Institute of Atmospheric Physics; CAS; Prague Czech Republic
5. Physics Department, Nowcast GmbH; University of Munich; Munich Germany