@Article{VargasBrumTerrGobb:2020:MeZoDr,
               author = "Vargas, F{\'a}bio and Brum, Christiano and Terra, Pedrina and 
                         Gobbi, Delano",
          affiliation = "{University of Illinois at Urbana-Champaign} and {University of 
                         Central Florida} and {University of Central Florida} and 
                         {Instituto Nacional de Pesquisas Espaciais (INPE)}",
                title = "Mean zonal drift velocities of plasma bubbles estimated from 
                         keograms of nightglow all-sky images from the brazilian sector",
              journal = "Atmosphere",
                 year = "2020",
               volume = "11",
               number = "1",
                pages = "e69",
                month = "jan.",
             keywords = "all-sky imager, ionospheric plasma bubble, zonal drift velocity, 
                         keograms, nightglow, OI6300 thermospheric emission.",
             abstract = "We present in this work a method for estimation of equatorial 
                         plasma bubble (EPB) mean zonal drift velocities using keograms 
                         generated from images of the OI 6300.0 nm nightglow emission 
                         collected from an equatorial station-Cariri (7.4 degrees S, 36.5 
                         degrees W), and a mid-latitude station-Cachoeira Paulista (22.7 
                         degrees S, 45 degrees W), both in the Brazilian sector. The mean 
                         zonal drift velocities were estimated for 239 events recorded from 
                         2000 to 2003 in Cariri, and for 56 events recorded over Cachoeira 
                         Paulista from 1998 to 2000. It was found that EPB zonal drift 
                         velocities are smaller (approximate to 60 ms(-1)) for events 
                         occurring later in the night compared to those occurring earlier 
                         (approximate to 150 ms(-1)). The decreasing rate of the zonal 
                         drift velocity is approximate to 10 ms(-1)/h. We have also found 
                         that, in general, bubble events appearing first in the west-most 
                         region of the keograms are faster than those appearing first in 
                         the east-most region. Larger zonal drift velocities occur from 19 
                         to 23 LT in a longitude range from -37 degrees to -33 degrees, 
                         which shows that the keogram method can be used to describe 
                         vertical gradients in the thermospheric wind, assuming that the 
                         EPBs drift eastward with the zonal wind. The method of velocity 
                         estimation using keograms compares favorably against the mosaic 
                         method developed by Arruda, D.C.S, 2005, but the standard 
                         deviation of the residuals for the zonal drift velocities from the 
                         two methods is not small (approximate to 15 ms(-1)).",
                  doi = "10.3390/atmos11010069",
                  url = "http://dx.doi.org/10.3390/atmos11010069",
                 issn = "2073-4433",
             language = "en",
           targetfile = "atmosphere-11-00069.pdf",
        urlaccessdate = "27 abr. 2024"
}