@InProceedings{MuellaPaSoDiLa:2009:CoPoOb,
               author = "Muella, M{\'a}rcio and Paula, Eurico Rodrigues de and Sobral, 
                         Jos{\'e} Humberto Andrade and Groves and Directorate, KeithSpace 
                         Vehicles and Laboratory, Air Force Research",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)}",
                title = "Conjugate point obseration of kilometer and meter scales 
                         irregularity zonal drift velocities",
            booktitle = "Proceedings...",
                 year = "2009",
         organization = "Iaga, 2009.",
             keywords = "ionospheric irregularities, GPS and VHF systems, irregularity 
                         drifts.",
             abstract = "Simultaneous observations of VHF and L-band scintillations were 
                         carried out during the Conjugate Point Equatorial Experiment 
                         (COPEX) campaign held from October 1st to December 10th 2002 over 
                         four sites in the Brazilian territory. The main objective of this 
                         campaign was to study the ionospheric bubbles dynamics and spatial 
                         distribution to investigate their generation mechanisms and their 
                         development along the same magnetic field line. The GPS 
                         (scintillation monitors) and VHF receivers were installed at Campo 
                         Grande (20.5o S, 54.7o W, -22.3o dip angle), Alta Floresta (9.7oS, 
                         56.0o W, -3.38o dip angle), Cachimbo (9.5oS, 54.8oW, -4.25o dip 
                         angle) and Boa Vista (2.8o N, 60.7o W, -22.0o dip angle). In this 
                         work we will focus only in the zonal spaced GPS (1.575 GHz) and 
                         VHF (240 MHz) receivers data. These receivers were set up to 
                         estimate ionospheric irregularities zonal velocities. The 100 m 
                         east-west magnetically spaced GPS receivers (SCINTMON) 
                         configuration was adopted to estimate the zonal velocity of the 
                         irregularities at 350 km height with a Fresnel scale size of about 
                         400 m. The VHF receivers measured the zonal velocities of the 
                         irregularities with scale size of about 1 km from signals received 
                         by the geostationary satellites Fleetsat 7 (- 100o W) and Fleetsat 
                         8 (-23o W) and using two sets of two antennas spaced about 100 m 
                         in the magnetic east-west direction. The velocities measured by 
                         these two methods were compared and the limitations and errors in 
                         the zonal velocity calculations for both methods are discussed.",
  conference-location = "Sopron, Hungary",
      conference-year = "23-30 Aug.",
             language = "en",
        urlaccessdate = "12 maio 2024"
}