@InProceedings{JaskulskiScAvMoMoDeMu:2007:StSoAt,
               author = "Jaskulski, Tiago and Schuch, Nelson Jorge and Aveiro, Henrique 
                         Carlotto and Moor, Lilian Piecha and Moro, Juliano and Denardini, 
                         Clezio Marcos and Muralikrishna, Polinaya",
          affiliation = "Southern Space Observatory, National Institute for Space Research, 
                         Santa Maria - RS), Brazil and Southern Space Observatory, National 
                         Institute for Space Research, Santa Maria - RS), Brazil and 
                         Southern Space Observatory, National Institute for Space Research, 
                         Santa Maria - RS), Brazil and Southern Space Observatory, National 
                         Institute for Space Research, Santa Maria - RS), Brazil and Space 
                         Science Laboratory of Santa Maria - LACESM/CT - UFSM, Santa Maria, 
                         RS, Brazil and {National Institute for Space Research – 
                         DAE/CEA/INPE – MCT} and {National Institute for Space Research – 
                         DAE/CEA/INPE – MCT}",
                title = "Study of the South Atlantic Magnetic Anomaly Influence on the 
                         Energetic Particle Precipitation",
            booktitle = "Proceedings...",
                 year = "2007",
         organization = "IUGG General Assembly, 24.",
             keywords = "Geomagnetic-anomaly, particle-precipitation, imaging-riometer – 
                         Aeronomia.",
             abstract = "The South Atlantic Magnetic Anomaly (SAMA), localized in the South 
                         Hemisphere, reaches almost all the region of the South Atlantic 
                         and extends longitudinally until the west coast of the South 
                         America. It is characterized as a region where the geomagnetic 
                         field has its lowest intensity and, therefore, there is a 
                         depression in its Field lines intensity. This depression anomaly 
                         occurs only in this region of the planet and its origin is 
                         attributed to the anti-symmetrical distribution of the electric 
                         currents in the interior of the planet. One of the consequences of 
                         the low intensity of the geomagnetic field in this region is that 
                         the energetic particles trapped in the Van Allens inner radiation 
                         belt can precipitate easily. The mirror point of the trapped 
                         particles over the SAMA is approximately 100 km of altitude, while 
                         is around 600 km in the magnetic conjugate point in the north 
                         hemisphere. In virtue of this, these energetic particles can 
                         precipitate over this region and dissipate their energy ionizing 
                         the atmospheric components, as occurs in the auroral region. This 
                         process is further enhanced during periods of geomagnetic storms 
                         and substorms. One of the usual methods to study the particle 
                         precipitation in the SAMA is through of the Imaging Riometer. The 
                         level of ionospheric absorption of cosmic noise is indirectly 
                         obtained from the data acquired with this equipment. From this 
                         data it is possible to infer the variation of the ionosphere 
                         electronic density. A higher ionospheric absorption indicates that 
                         an increase in the electronic density could have occurred in 
                         consequence of the energetic particle precipitation. Currently, 
                         there are three Imaging Riometer equipments in the SAMA region. 
                         The first one was installed in 1999 in the Southern Space 
                         Observatory - SSO/CRS/INPE - MCT, in S{\~a}o Martinho da Serra, 
                         Brazil, (29.4ºS, 53.8ºW). This observatory is strategically 
                         located near of the SAMA center, where the intensity of 
                         geomagnetic field is around of 23000 nT. In 2003 the second 
                         equipment was installed in Punta Arenas, Chile (53.1ºS, 71.0ºW). 
                         The third one was installed in Concepcion, Chile (37.5ºS, 72.7ºW). 
                         From these three equipments it has been possible to carry out 
                         studies to determine spatial scale and movement of the events of 
                         ionospheric absorption. The objective of this work is to present 
                         the analysis of data observed during a magnetically disturbed 
                         period with the Imaging Riometer installed at the Southern Space 
                         Observatory, as well as to give its brief description.",
  conference-location = "Perugia, Italy",
      conference-year = "2-13 July",
             language = "en",
        urlaccessdate = "16 jun. 2024"
}