1. Department of Aerospace Engineering Sciences; University of Colorado; Boulder Colorado USA
2. Department of Earth and Planetary Science; Kyushu University; Fukuoka Japan
3. Radiophysics Department; Kazan University; Kazan Russia
4. Institute for Meteorology; University of Leipzig; Leipzig Germany
5. Institute of Space and Atmospheric Studies; University of Saskatchewan; Saskatoon Canada
6. Department of Electronic and Electrical Engineering; University of Bath; Bath UK
7. Institute for Experimental Meteorology; Obninsk Russia