@Article{AbduSobrNaka:1985:LoLaSc,
               author = "Abdu, Mangalathyil Ali and Sobral, Jos{\'e} Humberto Andrade and 
                         Nakamura, Y",
                title = "On the low latitude scanning photometer signatures of equatorial 
                         ionospphere plasma bubbles",
              journal = "Revista Brasileira de Geof{\'{\i}}sica",
                 year = "1985",
               volume = "3",
               number = ":",
                pages = "33--39",
             keywords = "AERONOMIA, regi{\~o}es tropicais, fot{\^o}metros, bolhas de 
                         plasma, ionosferas, tropical regions, photometers, ionospheres.",
             abstract = "Meridional and east-west scan 6300 night airglow photometers are 
                         being extensively used at the low latitude station Cachoeira 
                         Paulista (23§S 45§W, dip latitude 14§), Brazil, for investigation 
                         of trans-equatorial ionospheric plasma bubble dynamics. The zonal 
                         velocities of the flux tube aligned plasma bubbles can be 
                         determined, in a straightforward way, from the east-west 
                         displacement of the airglow intensity valleys observed by the 
                         east-west scan photometer. On the other hand, the determination of 
                         the other velocity component of the plasma bubble motion (namely, 
                         vertical motion in the equatorial plane)has to be based on the 
                         meridional propagation of the airglow valleys observed by the 
                         meridional scan photometer. Such determinations of the bubbles' 
                         vertical rise velocity should, however, involve considerations on 
                         different bubble parameters such as, for example, the phase of the 
                         bubble event (whether growth, mature or decay phase), the limited 
                         east-west extension, and the often observed westward tilt of the 
                         bubble. In this brief report there were considered in some detail, 
                         possible influences of these different factors on the 
                         interpretation of low latitude scanning photometer data to infer 
                         trans-equatorial plasma bubble dynamics. RESUMO: Medidas de 
                         varredura da luminesc{\^e}ncia do oxig{\^e}nio at{\^o}mico (? = 
                         6300)no per{\'{\i}}odo noturno, nos planos verticais Leste-Oeste 
                         e Norte-Sul (magn{\'e}ticos), em Cachoeira Paulista (23§S 45§W, 
                         inclin{\c{c}}{\~a}o14§), Brasil, tem sido utilizadas em grande 
                         escala no estudo das chamadas bolhas ionosf{\'e}ricas. Tais 
                         bolhas s{\~a}o zonas de deple{\c{c}}{\~a}o de eletron e 
                         {\'{\i}}ons e extendem-se por milhares de quil{\^o}metros ao 
                         longo das linhas de for{\c{c}}a do campo magn{\'e}tico terrestre 
                         e transversalmente, por cerca de algumas dezenas ou centenas de 
                         quil{\^o}metros. As velocidades dessas bolhas, no sentido 
                         leste-oeste, s{\~a}o facilmente determinadas pelas medidas 
                         fotom{\'e}tricas, Por outro lado, velocidade vertical de 
                         propaga{\c{c}}{\~a}o pode ser determinada pela sua 
                         proje{\c{c}}{\~a}o no plano vertical meridional. Contudo a 
                         determinag{\c{c}}{\~a}o da componente vertical envolve 
                         considera{\c{c}}{\~a}o de diversos par{\^a}metros, tais como a 
                         fase da bolha (seja de crescimento, desenvolvida ou de 
                         decaimento), a limitada extens{\~a}o leste-oeste e a 
                         freq{\"u}entemente observada inclina{\c{c}}{\~a}o da bolha para 
                         oeste. Neste trabalho considerou-se poss{\'{\i}}veis 
                         influ{\^e}ncias destes diferentes fatores na 
                         interpreta{\c{c}}{\~a}o de dados fotom{\'e}tricas de baixa 
                         latitude, para inferir sobre a din{\^a}mica da bolha de plasma.",
                 issn = "0102-261X",
                label = "9681",
           targetfile = "8739.pdf",
        urlaccessdate = "11 maio 2024"
}