author = "Alves, Livia Ribeiro and Caraballo, R. and Hartmann, G. A. and 
                         Barbosa, C. S.",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Facultad 
                         de Ingenieria (Udelar)} and {Universidade Estadual de Campinas 
                         (UNICAMP)} and {Observat{\'o}rio Nacional (ON/MCTI)}",
                title = "Geomagnetically induced currents measured at low latitude during 
                         the space disturbances on 07-08 September, 2017",
                 year = "2018",
         organization = "Latin American Conference on Space Geophysics, 11. (COLAGE)",
             abstract = "Geomagnetically induced currents (GICs) were rst described by W. 
                         H. Barlow in 1849 as anomalous currents in telegraphic wires. 
                         These phenomena are currently understood as a ground eect arising 
                         from a chain of events in the Sun-Earth system. They are mainly 
                         observed at power networks and their amplitudes are controlled by 
                         a combination of geophysical conditions and network parameters. 
                         The magnetic disturbances detected on the ground came from the 
                         coupling of highly disturbed solar wind plasma propagating through 
                         the interplanetary medium which eventually impinges on the Earth's 
                         magnetosphere. The perturbed magnetosphere-ionosphere coupling can 
                         produce intense currents systems that can induce strong 
                         geoelectric elds at the Earth's surface, which in turn generate 
                         currents that can ow through grounded technological infrastructure 
                         as it oers low-resistance pathways. The available GIC datasets 
                         show that at high latitudes GIC records can reach hundreds of 
                         Amperes, leading to failure at transformers, such as reported at 
                         Hydro-Quebec, in Canada in 1989 and at Malmo, in Sweden in 2011. 
                         Due to the higher GIC intensities recorded at auroral regions, the 
                         GIC data at mid-to-low latitudes had been scarce. However, more 
                         recent works have shown that GIC can reach tenths of Amperes 
                         during intense sudden commencement and at the peak of geomagnetic 
                         storms. Despite intense geomagnetic storms are rare during the 
                         solar cycle declining phase, on the period of 04-06 September 2017 
                         solar activity was increased due to the evolution of the active 
                         region 2673, thus it was observed two CME propagating Earthwards. 
                         The geomagnetic storm initiated at the beginning of 07 September 
                         evolving to one day long main phase as high as -140 nT. Besides 
                         the geomagnetic disturbances due to the ICME shock, also at least 
                         two intense solar ares (at 06 and 10 September 2017) causing spike 
                         disturbances in the geomagnetic eld measured at the ground. 
                         Considering the relevance of the intense space disturbance during 
                         the solar cycle declining phase, in this work, we use de 
                         Lethinen-Pirjola model to calculated GIC at low latitude power 
                         network located at Brazil and Uruguay during the period of the 
                         disturbance. The GIC results obtained during the solar cycle 
                         declining phase, compared to the long-term survey available at 
                         literature, are used to verify the signicance of GIC intensity 
                         observed at low latitude measured after the ICME disturbance and 
                         also with the are geomagnetic disturbance registered after a 
                         long-term of solar cycle condition.",
  conference-location = "Buenos Aires, Argentina",
      conference-year = "16-20 abr.",
             language = "en",
        urlaccessdate = "01 dez. 2020"