1. National Institute for Space Research, Division of Space Geophysics; Av. dos Astronautas, Jd. Granja, Sao Jose dos Campos SP Brazil
2. Centro de Rádio Astronomia e Astrofísica Mackenzie, EE, UPM; Rua da Consolacao, 896 - Edificio Reverendo Modesto Carvalhosa, 7º andar, Consolacao Sao Paulo SP Brazil
3. Lebedev Physical Institute of the Russian Academy of Sciences (Solar and Cosmic Ray Physics Laboratory); Moscow Russia
4. Complejo Astronómico el Leoncito, CNICET; San Juan Argentina