1. Indian Institute of Tropical Meteorology; Pune India.
2. Service d'Aeronomie; Institut Pierre Simon Laplace; Verrieres-Le-Buisson France.
3. Centre for Research in Earth and Space Technology; University of Western Ontario, London; Ontario Canada.
4. High Altitude Observatory; National Center for Atmospheric Research; Boulder Colorado USA.
5. Radiation and Aerosol Branch; NASA Langley Research Center; Hampton Virginia USA.
6. Instituto de Astronomia y Fisica del Espacio; Ciudad Universitaria; Buenos Aires Argentina.
7. Department of Earth and Atmospheric Science; York University; Toronto Ontario Canada.
8. Physics Department; University of Wuppertal; Wuppertal Germany.
9. Atmospheric and Space Physics Group; Australian Antarctic Division; Tasmania Australia.
10. Centre for Research in Earth and Space Science; York University; Toronto Ontario Canada.
11. Obukhov Institute of Atmospheric Physics; Russian Academy of Science; Moscow Russia.
12. Atmospheric Sciences Research; NASA Langley Research Center; Hampton Virginia USA.
13. Physics Department; Colorado State University; Fort Collins Colorado USA.
14. Leibniz-Institute of Atmospheric Physics; Kühlungborn Germany.
15. Instituto Nacional de Pesquisas Espaciais; Sao Jose dos Campos Brazil.
16. Meteorologiska Institutionen; Stockholms Universitet; Stockholm Sweden.
17. University Courses on Svalbard; Longyearbyen Norway.