%0 Journal Article
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%@nexthigherunit 8JMKD3MGPCW/3ETL868
%@archivingpolicy denypublisher denyfinaldraft24
%@issn 1364-6826
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%@resumeid 8JMKD3MGP5W/3C9JHG7
%@resumeid
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%@resumeid 8JMKD3MGP5W/3C9JHCM
%@usergroup administrator
%3 Ionospheric plasma bubble.pdf
%B Journal of Atmospheric and Solar-Terrestrial Physics
%@dissemination WEBSCI; PORTALCAPES; AGU; MGA; COMPENDEX.
%X In tropical regions, all-sky imaging observations of the 01 630 nm emission show quasi north-south aligned intensity depletion bands, which are the optical signatures of large-scale F-region plasma irregularities (plasma bubbles). By observing the west-east motion of the intensity depleted bands it is possible to infer the ionospheric plasma bubble zonal velocity. All-sky images from Sao Joao do Cariri (7.4degreesS, 36.5degreesW) and from Cachoeira Paulista (22.7degreesS, 45.0degreesW), Brazil, between December 1999 and February 2000 (summer in the southern hemisphere), are analyzed in order to investigate the nocturnal and latitudinal behavior of the ionospheric plasma bubble zonal drift velocities. The data set included 12 nights from Sao Joao do Cariri (equatorial region) and 12 nights from Cachoeira Paulista (low latitude). An interesting characteristic observed is the significant latitudinal variations in the ionospheric plasma bubble zonal drifts in the tropical region, between 20:00-22:00 local time. The average result of the latitudinal analyses has revealed two peaks in the ionospheric plasma bubble zonal drift velocities. One peak is located near the magnetic equator (similar to160 m/s), occurring between 21:00 and 22:00 LT, and another peak is located at approximately 19degreesS latitude (similar to150 m/s), occurring between 20:00 and 22:00 LT. The valley in the latitudinal variations is located approximately near 10degreesS (similar to120 m/s) and this reduction in the ionospheric plasma bubble zonal drifts is attributed to a reduction in the zonal neutral wind velocities. A comparison of the observed latitudinal variations in the ionospheric plasma bubble zonal drifts with the zonal winds obtained from the HWM-90 model reveals good agreement. We find that the increase in electron density within the Equatorial Ionospheric Anomaly was sufficient to account for the observed reduction in the zonal wind velocities. The observed development and motion of the nighttime F-region irregularities in the tropical region are presented and discussed in this paper.
%8 JUL.
%N 10
%T Ionospheric plasma bubble zonal drifts over the tropical region: a study using OI 630nm emission all-sky images
%K airglow, plasma bubbles, all-sky imaging, tropical ionosphere, plasma drifts, ionospheric F-region, equatorial spread-f, imaging observations, radar observations, depletions, irregularities, solar, velocities, winds.
%@secondarytype PRE PI
%@group DAE-INPE-MCT-BR
%@copyholder SID/SCD
%@secondarykey INPE-10261-PRE/5776
%2 sid.inpe.br/marciana/2004/01.12.10.42.07
%@affiliation Inst Nacl Pesquisas Espaciais, BR-12245970 Sao Jose Dos Campos, Brazil,
%@affiliation Inst Nacl Pesquisas Espaciais, BR-12245970 Sao Jose Dos Campos, Brazil,
%@affiliation UNIVAP, BR-12244000 Sao Jose Dos Campos, Brazil,
%@affiliation Univ Fed Paraiba, BR-58109000 Campina Grande, PB, Brazil,
%@affiliation Utah State Univ, Logan, UT 84322 USA,
%@language English
%P 1117-1126
%4 sid.inpe.br/marciana/2004/01.12.10.42
%D 2003
%V 65
%A Pimenta, Alexandre Alvares,
%A Bittencourt, José Augusto,
%A Fagundes, Paulo Roberto,
%A Sahai, Y.,
%A Buriti, Ricardo A.,
%A Takahashi, Hisao,
%A Taylor, Michael J.,
%@area CEA