author = "Jonah, Olusegun Folarin and Kherani, Esfhan Alam and Paula, Eurico 
                         Rodrigues de",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)}",
                title = "Investigations of conjugate MSTIDS over the Brazilian sector 
                         during daytime",
              journal = "Journal of Geophysical Research: Space Physics",
                 year = "2017",
               volume = "122",
               number = "9",
                pages = "9576--9587",
                month = "Sept.",
             abstract = "This study focuses on the daytime medium-scale traveling 
                         ionospheric disturbances (MSTIDs) observed at conjugate 
                         hemispheres. It is the first time that the geomagnetical conjugate 
                         daytime MSTIDs are observed over the South America sector. To 
                         observe the MSTID characteristics, we used detrended total 
                         electron content (TEC) derived from Global Navigation Satellite 
                         Systems receivers located at Brazilian sector covering the 
                         Northern and Southern Hemispheres along the same magnetic 
                         meridian. The geographic grid of 1N to 14S in latitude and 60S 
                         to 50S in longitude was selected for this study. The 
                         cross-correlation method between two latitudes and longitudes in 
                         time was used to observe the propagation of the MSTID waves. The 
                         following features are noted: (a) MSTIDs are well developed at 
                         both hemispheres; (b) the peak MSTIDs amplitudes vary from one 
                         hemisphere to another; hence, we suppose that MSTIDs generated in 
                         Southern Hemisphere or Northern Hemisphere mirrored in the 
                         conjugate hemisphere; (c) the gravity wave-induced electric fields 
                         from one hemisphere map along the field lines and generate the 
                         mirrored MSTIDs in the conjugate region. To investigate the 
                         hemispheric mapping mechanism, a rough approximation for the 
                         integrated field line conductivity ratio of E and F regions is 
                         calculated using digisonde E and F region parameters. We noted 
                         that during the period of mapping the decrease in E region 
                         conductivity results in an increase in total conductivity. This 
                         shows that the E region was partially short circuited; hence, 
                         electric field generated at F region could map to the conjugate 
                         hemisphere during daytime: daytime MSTIDs at conjugate regions; 
                         mechanisms responsible for daytime electrified MSTIDs; gravity 
                         wave-induced electric field role in daytime MSTIDs.",
                  doi = "10.1002/2017JA024365",
                  url = "http://dx.doi.org/10.1002/2017JA024365",
                 issn = "2169-9402",
             language = "en",
           targetfile = "jonah_investigations.pdf",
        urlaccessdate = "05 dez. 2020"