SEASONAL AND SOLAR ACTIVITY VARIATIONS OF F3 LAYER AND StF-4 (F-LAYER QUADRUPLE STRATIFICATION) NEAR THE EQUATORIAL REGION

Alexandre Tardelli1, Paulo Roberto Fagundes2, Michael Pezzopane3 and Venkatesh Kavutarapu1, (1)University of Vale do Paraíba, Sao Jose dos Campos, Brazil, (2)University of Vale do Paraíba, Fisica & Astronomia, Sao Jose dos Campos, Brazil, (3)Istituto Nazionale di Geofisica e Vulcanologia, Palermo, Italy