Instituto de Geofisica, Universidad Nacional Autonoma de Mexico, IGEF, C.U., Mexico D. F., 04510, Mexico; Catholic University of America, 200 Hannan Hall, Washington DC, 20064, USA
NASA/GSFC, Code 695, Greenbelt, MD 20771, USA
NASA/GSFC, Code 695, Greenbelt, MD 20771, USA; Catholic University of America, 200 Hannan Hall, Washington DC, 20064, USA
Divisao de Geofisica Espacial, Instituto Nacional de Pesquisas Espaciais, Sao Jose dos Campos, Sao Jose dos Campos, 12121, Brazil