@InProceedings{MuralikrishnaOdriBati:2015:WaStOb,
               author = "Muralikrishna, Polinaya and Odriozola, Siomel Savio and Batista, 
                         Inez Staciarini",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)}",
                title = "Wave structures observed in the Equatorial F-region plasma density 
                         and temperature during the sunset period",
                 year = "2015",
         organization = "International Congress of the Brazilian Geophysical Society, 14.",
             abstract = "Electron density and temperature measurements were made recently 
                         with rocket-borne Langmuir probes on 2-nd December 2011 using a 
                         Brazilian VS-30 single stage rocket and on 8-th December 2012 
                         using a two stage VS-30/Orion rocket. The first launch was made 
                         from the equatorial rocket launching station CLBI in Natal, Brazil 
                         and the second one from the CLA in Alc{\^a}ntara-MA. Both the 
                         launches were made soon after the local sunset. The ground 
                         equipments operated during the rocket launches clearly showed the 
                         rapid rise of the F-region base indicating probably the pre 
                         reversal enhancement of the F-region vertical plasma drift. At the 
                         time of launch the bubble activity was also at its peak as 
                         indicated by the presence of strong spread-F traces in the 
                         ionograms. The electron density and temperature height profiles 
                         could be estimated from the LP data up to the rocket apogee 
                         altitudes of 139km during the first launch and 428m km during the 
                         second launch. During the first launch the Fregion valley region 
                         showed the presence electron temperatures as high as 2000 ēK while 
                         the temperatures expected from the existing models are around 500 
                         ēK. During the second launch also ground equipments operated at 
                         equatorial stations showed rapid rise in the base of the F-layer 
                         creating ionospheric conditions favorable for the generation of 
                         plasma bubbles. During this launch also electron temperatures as 
                         high as 3500ēK were observed in the valley region both during the 
                         rocket upleg and downleg. These profiles are compared with model 
                         electron density and temperature profiles as well as with electron 
                         density and temperature profiles observed under conditions of no 
                         plasma bubbles. The electron density and temperatures profiles 
                         observed during both the launches showed the presence of 
                         significantly large amplitude waves indicating intense wave 
                         activity in the valley region close to sunset period. These wave 
                         activities are probably related to the electrodynamic processes 
                         that exist in this region during the sunset period.",
  conference-location = "Rio de Janeiro, RJ",
      conference-year = "3-6 Aug.",
        urlaccessdate = "25 abr. 2024"
}