author = "Sobral, Jose Humberto Andrade and Abdu, Mangalathayil Ali and 
                         Batista, Inez Staciarini and Zamlutti, Carlos Jose",
                title = "Wave disturbances in the low latitude ionosphere and equatorial 
                         ionospheric plasma depletions",
              journal = "Journal of Geophysical Research",
                 year = "1981",
               volume = "86",
               number = "A3",
                pages = "1374--1378",
                month = "Mar.",
             keywords = "AERONOMIA, baixa ionosfera, ondas, perturba{\c{c}}{\~o}es 
                         ionosf{\'e}ricas, densidade do plasma, lower ionosphere, waves, 
                         ionospheric disturbances, ionospheric propagation, plasma 
             abstract = "An isolated nighttime ionospheric wave disturbance was observed 
                         simultaneously by a meridional scanning 6300- A photometer, a 
                         6300- A zenith photometer, a 30-MHz riometer, and an ionosonde 
                         over Cachoeira Paulista, a low-latitude station in Brazil. From 
                         the results we have identified at least two different scale sizes 
                         for the disturbances which could be broadly classified as(l)a 
                         larger scale component easily identified in the riometer data and 
                         has characteristics similar to those of a large scale TID 
                         and(2)smaller scale disturbances observable in the scanning 
                         photometer data, occurring during the ascending phases of the 
                         larger scale waves. A Fourier analysis of the zenith airglow 
                         variations clearly reveals a dominant period of about 104 min that 
                         seems to correspond to the period of the larger scale waves and no 
                         single dominant period is present for the smaller scale waves. 
                         Whereas all these have a poleward velocity component, the smaller 
                         scale waves show up this feature more markedly. The equatorial 
                         source of the smaller scale disturbances and other characteristics 
                         have led us to suggest that these disturbances are perhaps the 
                         low-latitude manifestations of the upward propagating field 
                         aligned plasma bubbles in the equatorial ionosphere.",
                 issn = "0148-0227 and 2156-2202",
                label = "2054",
           targetfile = "INPE-1806.pdf",
        urlaccessdate = "22 jan. 2021"