@Article{Clemesha:1990:ObTh,
               author = "Clemesha, Barclay Robert",
                title = "Stratification processes in the atmospheric sodium layer: 
                         observations and theory",
              journal = "Advances in Space Research",
                 year = "1990",
               volume = "10",
               number = "10",
                pages = "(10)59--(10)70",
                 note = "COSPAR-ESPOO, 27, 18-29 July, 1988, Helsinkei, FI.",
             keywords = "AERONOMIA, ATMOSPHERIC LASERS, ATMOSPHERIC TIDES, SODIUM LAYER.",
             abstract = "The mechanisms responsible for the formation of the alkali metal 
                         layers seem to be quite different in nature to those responsible 
                         for other atmospheric layers. In discussing the sodium layer in 
                         this context we must include both the mechanisms responsible for 
                         its basic production and the phenomena which produce structures 
                         within the layer. Although there is little doubt that the sodium 
                         layer owes its origin to the deposition into the atmosphere of 
                         extra-terrestrial material, how this deposition leads to the 
                         formation of a narrow layer of free sodium atoms is still an open 
                         question. With respect to the formation of structures within the 
                         layer it is clear that tides and gravity waves play an important 
                         role, although there can be little doubt that other factors are 
                         also at work. Of particular interest is the observation of thin 
                         layers having peak densities about an order of magnitude greater 
                         than normal, and a width an order of magnitude less. A number of 
                         mechanisms for the formation of these layers have been discussed 
                         in the literature, including direct meteor deposition, ion layer 
                         formation via the windshear mechanism, and evaporation from 
                         aerosol layers. None of these mechanisms has been analysed in 
                         detail, however, and the origin of these layers is still open to 
                         debate.",
                 issn = "0273-1177",
                label = "2886",
             language = "en",
           targetfile = "1-s2.0-027311779090010W-main.pdf",
        urlaccessdate = "19 maio 2024"
}