%0 Journal Article
%@holdercode {isadg {BR SPINPE} ibi 8JMKD3MGPCW/3DT298S}
%@nexthigherunit 8JMKD3MGPCW/3ETL868
%X The possible role, on L-band scintillation activity, played by the nighttime magnetic meridional component of the thermospheric horizontal neutral winds, the post-sunset F-layer base height, the electrical field pre-reversal enhancement (PRE) and the latitudinal gradients of the F2-layer peak density is analyzed, considering different cases of scintillation occurrence (and their latitudinal extent) during August and September 2002. The meridional winds were derived over low-latitudes from a modified form of the nonlinear time-dependent servo-model. A chain of two scintillation monitors and three digital ionosondes was operational in Brazil and used to collect, respectively, global positioning system signal amplitude scintillation and ionospheric height (h′F; hpF2) and frequency (foF2) parameters. From the overall behavior in the 2 months analyzed, the results suggest that high near sunset upward vertical plasma drifts are conducive for the generation of spread-F irregularities, whereas large poleward meridional winds tend to suppress the development of plasma bubble irregularities and the occurrence of their associated scintillations. Even when generated, a reduced fountain effect, due to weak electric field PRE, acts for the bubbles to be expanded less effectively to higher latitudes. The results also reveal that high F-layer base and peak heights (at equatorial and off-equatorial latitudes), and intense gradients in the F2-peak density between the dip equator and the equatorial anomaly crests, are favorable conditions for the generation of F-region irregularities and increased scintillation activity. Other distinct features of the controlling factors in the cases of occurrence and non-occurrence of equatorial scintillations are presented and discussed.
%@mirrorrepository sid.inpe.br/mtc-m19@80/2009/08.21.17.02.53
%8 Sept.
%N 5
%T Thermospheric Meridional Wind Control on Equatorial Scintillations and the Role of the Evening F-Region Height Rise, E × B Drift Velocities and F2-Peak Density Gradients
%@secondarytype PRE PI
%K Ionospheric scintillation - Ionospheric irregularity - Thermospheric neutral winds - Equatorial ionosphere - Ionospheric gradients - Global positioning system.
%@archivingpolicy denypublisher denyfinaldraft12
%@usergroup administrator
%@usergroup marciana
%@group DAE-CEA-INPE-MCT-BR
%@group DAE-CEA-INPE-MCT-BR
%@group
%@group DAE-CEA-INPE-MCT-BR
%@group DAE-CEA-INPE-MCT-BR
%3 fulltext.pdf
%@secondarykey INPE--PRE/
%@secondarymark A2_GEOCIÊNCIAS
%@issn 0169-3298
%2 sid.inpe.br/mtc-m19@80/2010/08.02.12.46.06
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@affiliation Laboratório de Física e Astronomia, Universidade do Vale do Paraiba, IP&D, São José dos Campos, São Paulo, Brazil
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%B Surveys in Geophysics
%@versiontype publisher
%P 509-530
%4 sid.inpe.br/mtc-m19@80/2010/08.02.12.46
%@documentstage not transferred
%D 2010
%V 31
%@doi 10.1007/s10712-010-9101-3
%A Muella, Marcio Tadeu de Assis Honorato,
%A Paula, E. R. de,
%A Fagundes, P. R.,
%A Bittencourt, J. A.,
%A Sahai, Y.,
%@dissemination WEBSCI; PORTALCAPES.
%@area CEA