1. Institute of Geophysics Polish Academy of Sciences Warsaw Poland
2. Center of Radio Astronomy and Astrophysics Mackenzie Engineering School Mackenzie Presbyterian University Sao Paulo Brazil
3. National Institute for Space Research Sao Jose dos Campos Brazil
4. Complejo Astronomico El Leoncito, CASLEO San Juan Argentina
5. Instituto de Ciencias Astronomicas de la Tierra y el Espacio, ICATE‐CONICET‐UNSJ San Juan Argentina