@Article{AbduRai:1975:GrWaLo,
               author = "Abdu, Mangalathayil Ali and Rai, D. B",
                title = "Gravity waves in low latitude F region",
              journal = "Planetary and Space Science",
                 year = "1975",
               volume = "23 Part 1",
               number = "3",
                pages = "487--491",
             keywords = "AERONOMIA.",
             abstract = "The paper presents a study of large scale travelling ionospheric 
                         disturbances detected by riometers operating at 30 MHz, over 
                         S{\~a}o Jos{\'e} dos Campos (23*S, 45'W)and a nearby location in 
                         S{\~a}o Paulo, Brasil. The TID's are observed mainly at night and 
                         have wavelengths greater than 500 Kin. In a few cases it is 
                         possible to determine the E-W component of the velocity of 
                         propagation, which is of the order of 450 Km per hour. Most of the 
                         events are characterized by disperions; the period is found to 
                         increase from half an hour to nearly two hours. These and other 
                         features are identified with the propagation of atmospheric 
                         gravity waves in the F-region, whose source might be located far 
                         away from the observing site. The results also suggest that a 
                         suitably designed riometer system could profitably be used for 
                         future investigation of gravity waves in the F-region in low 
                         latitude.",
                 issn = "0032-0633",
                label = "1622",
           targetfile = "INPE 462- Gravity waves in low latitude F region.pdf",
        urlaccessdate = "20 maio 2024"
}