@Article{SobralAbdu:1989:LaGrPl,
               author = "Sobral, Jos{\'e} Humberto Andrade and Abdu, Mangalathayil Ali",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)}",
                title = "Latitudinal gradient in the plasma bubble zonal velocities as 
                         observed by scanning 630 nm airglow measurements",
              journal = "Journal of Geophysical Research",
                 year = "1989",
               volume = "accept",
             keywords = "bybbles, ionospheric bubbles, low latitude dynamics of the 
                         ionosphere, airglow.",
             abstract = "Equatorial ionospheric plasma bubble zonal velocities were 
                         measured using two 630 nm scanning photometers. Simultaneous 
                         scanning measurements were made in two east-west planes that were 
                         tilted 300 northward and southward of the vertical. The results of 
                         measurements carried out during 5 days covering the summer 
                         equinoctial period of 1988, presented here, show evidence of 
                         marked latitudinal gradient {\'{\i}}n the bubble zonal 
                         velocities, the velocities decreasing with increasing latitude 
                         over our low latitude observing site, Cachoeira Paulista (-28° 
                         dip). We suggest that this velocity gradient is consistent with 
                         expectations at solar minimum, when our measurements may be 
                         associated with the region above the maximum in the eastward 
                         plasma velocity height profile.",
             language = "en",
           targetfile = "INPE-4667.pdf",
        urlaccessdate = "25 abr. 2024"
}