%0 Journal Article
%@holdercode {isadg {BR SPINPE} ibi 8JMKD3MGPCW/3DT298S}
%@nexthigherunit 8JMKD3MGPCW/3ETL868
%@resumeid 8JMKD3MGP5W/3C9JH2U
%X The statistics of pre-midnight 5-m irregularities in the equatorial F region over Sao Luis is presented. The data set ranges from October 2001 to December 2008 and covers maximum solar-flux-to-minimum solar flux epoch. The variabilities in irregularity parameters, namely, height and time of their appearance in the radar echoes, with solar-flux variation are presented. The seasonal variations (combined over all years, irrespective of solar-flux) of occurrence of irregularities, occurrence of bottom-type layer (or bottom-side irregularities without plume) and bottom-side/topside plume (or bottom-side irregularities with plume) are presented. The largest occurrences of bottom-side irregularities without plume and with plume are found on April (equinox) and December (summer) months respectively. The ambient ionospheric conditions namely prereversal evening vertical drift, bottom-side density gradient and off-equatorial E region conductivity are inferred using digisonde measurements during April 2002 and December 2002. Based on these conditions and recent studies on gravity wave climatology over Brazil, it is suggested that shear in zonal plasma drift and low gravity wave activity may account for less occurrence of plume during April as compared to December months. This suggestion is quantified using numerical simulation model of collisional-interchange instability (CII) and plasma bubble.
%8 Jul
%N 11-12
%T Observations of pre-midnight 5-m irregularities in the equatorial F region over São Luís, Brazil: Solar-flux dependence and seasonal variations
%@electronicmailaddress eurico@dae.inpe.br
%@electronicmailaddress
%@electronicmailaddress rica_yvan@dae.inpe.br
%@secondarytype PRE PI
%K coherent scatter radar, Plasma irregularity.
%@archivingpolicy denypublisher denyfinaldraft24
%@usergroup administrator
%@usergroup lattes
%@usergroup tereza@sid.inpe.br
%@group DAE-CEA-INPE-MCT-BR
%@group
%@group DAE-CEA-INPE-MCT-BR
%@e-mailaddress eurico@dae.inpe.br
%3 Paula-JASTP-v73-n11-12-p1544-54-science[1].pdf
%@secondarymark B2_ASTRONOMIA_/_FÍSICA B1_CIÊNCIAS_BIOLÓGICAS_I B1_ECOLOGIA_E_MEIO_AMBIENTE B1_ENGENHARIAS_IV B1_GEOCIÊNCIAS A2_INTERDISCIPLINAR
%F lattes: 0341267060519130 1 PaulaAlamCuevCama:2011:SoDeAn
%@issn 1364-6826
%2 dpi.inpe.br/plutao/2011/09.22.16.51.01
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@affiliation
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%B Journal of Atmospheric and Solar-Terrestrial Physics
%@versiontype publisher
%P 1544-1554
%4 dpi.inpe.br/plutao/2011/09.22.16.51
%@documentstage not transferred
%D 2011
%V 73
%@doi 10.1016/j.jastp.2011.03.014
%O Setores de Atividade: Pesquisa e desenvolvimento científico.
%A Paula, Eurico Rodrigues de,
%A Alam Kherani, E.,
%A Cueva, Ricardo Yvan de La Cruz,
%A Camargo, L. A. P.,
%@dissemination WEBSCI; PORTALCAPES; AGU; MGA; COMPENDEX.
%@area CEA