author = "Correia, Emilia and Spogli, Luca and Alfonsi, Lucilla and 
                         Cesaroni, Claudio and Gulisano, Adriana M. and Thomas, Evan G. and 
                         Hidalgo Ramirez, Ray F. and Rodel, Alexandre A.",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Istituto 
                         Nazionale di Geofisica e Vulcanologia} and {Istituto Nazionale di 
                         Geofisica e Vulcanologia} and {Istituto Nazionale di Geofisica e 
                         Vulcanologia} and {Instituto Ant{\'a}rtico Argentino} and 
                         {Dartmouth College} and {Universidade Presbiteriana Mackenzie} and 
                         {Universidade Presbiteriana Mackenzie}",
                title = "Ionospheric F-region response to the 26 September 2011 geomagnetic 
                         storm in the Antarctica American and Australian sectors",
              journal = "Annales Geophysicae",
                 year = "2017",
               volume = "35",
               number = "5",
                pages = "1113--1129",
                month = "Oct.",
             keywords = "Ionosphere (Ionospheric disturbances).",
             abstract = "The ionospheric response at middle and high latitudes in the 
                         Antarctica American and Australian sectors to the 26-27 September 
                         2011 moderately intense geomagnetic storm was investigated using 
                         instruments including an ionosonde, riometer, and GNSS receivers. 
                         The multi-instrument observations permitted us to characterize the 
                         ionospheric storm-enhanced density (SED) and tongues of ionization 
                         (TOIs) as a function of storm time and location, considering the 
                         effect of prompt penetration electric fields (PPEFs). During the 
                         main phase of the geomagnetic storm, dayside SEDs were observed at 
                         middle latitudes, and in the nightside only density depletions 
                         were observed from middle to high latitudes. Both the increase and 
                         decrease in ionospheric density at middle latitudes can be 
                         attributed to a combination of processes, including the PPEF 
                         effect just after the storm onset, dominated by disturbance dynamo 
                         processes during the evolution of the main phase. Two SEDs-TOIs 
                         were identified in the Southern Hemisphere, but only the first 
                         episode had a counterpart in the Northern Hemisphere. This 
                         difference can be explained by the interhemispheric asymmetry 
                         caused by the high-latitude coupling between solar wind and the 
                         magnetosphere, which drives the dawn-to-dusk component of the 
                         interplanetary magnetic field. The formation of polar TOI is a 
                         function of the SED plume location that might be near the dayside 
                         cusp from which it can enter the polar cap, which was the case in 
                         the Southern Hemisphere. Strong GNSS scintillations were observed 
                         at stations collocated with SED plumes at middle latitudes and 
                         cusp on the dayside and at polar cap TOIs on the nightside.",
                  doi = "10.5194/angeo-35-1113-2017",
                  url = "http://dx.doi.org/10.5194/angeo-35-1113-2017",
                 issn = "0992-7689",
             language = "en",
           targetfile = "correia_ionospheric.pdf",
        urlaccessdate = "20 jan. 2021"