1. NASA Goddard Space Flight Center; Greenbelt MD USA
2. INPE Instituto Nacional de Pesquisas Espaciais, São José dos Campos; São Paulo Brazil
3. Catholic University of America; Washington DC USA
4. EEL/USP Escola de Engenharia de Lorena/Universidade de São Paulo; Lorena Brazil
5. Research Center for Astronomy and Earth Sciences, Geodetic and Geophysical Institute; Hungarian Academy of Sciences; Sopron Hungary
6. School of Physics and Astronomy; University of Southampton; Southampton UK