@Article{CostaDomiMendBrum:2011:CaSt,
               author = "Costa, Aracy Mendes da and Domingues, Margarete Oliveira and 
                         Mendes Junior, Odim and Brum, Christiano Garnett Marques",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)} and Natl Astron \& Ionosphere Ctr, 
                         Space \& Atmospher Sci Dept, Arecibo Observ, Arecibo, PR USA",
                title = "Interplanetary medium condition effects in the South Atlantic 
                         Magnetic Anomaly: A case study",
              journal = "Journal of Atmospheric and Solar-Terrestrial Physics",
                 year = "2011",
               volume = "73",
               number = "11-12",
                pages = "1478--1491",
             keywords = "space electrodynamics, south atlantic magnetic anomaly, solar 
                         energetic particles, wavelet, space weather keywords plus: 
                         solar-proton events, energetic electron-precipitation, polar-cap 
                         absorption, geomagnetic storm, equatorial ionosphere, model 
                         simulations, forbush decreases, particle events, space-weather, 
                         cosmic-rays.",
             abstract = "One way to investigate the magnetosphere-ionosphere coupling is 
                         through the simultaneous observation of different parameters 
                         measured at different locations of the geospace environment and 
                         try to determine some relationships among them. The main objective 
                         of this work is to examine how the solar energetic particles and 
                         the interplanetary medium conditions may affect the space and time 
                         configuration of the ring current at low-latitudes and also to get 
                         a better understanding on how these particles interfere with the 
                         lower ionosphere in the South Atlantic Magnetic Anomaly region 
                         (SAMA). To accomplish this, the cosmic noise absorption (CNA) and 
                         the horizontal component of the Earth's magnetic field data 
                         measured from sites located in the SAMA region were compared with 
                         the proton and electron fluxes, interplanetary medium conditions 
                         (solar wind and the north-south component of the interplanetary 
                         magnetic field measured on board satellites), the SYM-H index and 
                         magnetometer data from Kakioka (KAK-Japan), located significantly 
                         outside the SAMA region. The time series analyzed correspond to 
                         the geomagnetic disturbance that occurred on August 25-30, 1998. 
                         The analysis was performed by implementing wavelet techniques, 
                         with particular attention to singularities detection, which 
                         highlights the presence of transient signals. The results are 
                         discussed in terms of the first three wavelet decomposition levels 
                         of the parameters. The magnitude of wavelet coefficients of the 
                         solar wind and proton flux at the two energy ranges analyzed is 
                         timely well correlated, indicating that these two signals are 
                         energetically linked. The larger wavelet coefficient amplitude of 
                         KAK and VSS magnetograms shows time delays that are compatible 
                         with an asymmetric configuration of the ring current, considering 
                         that at the storm time, VSS was at the dawn sector of the 
                         magnetosphere and KAK at the dusk side. The wavelet analysis of 
                         CNA signals reveals that the signal may be sensitive to the 
                         ionization produced by energetic electrons and protons as well. 
                         The time delays observed in wavelet coefficients may give an 
                         indication of the different accelerating process to which the 
                         particles are submitted when traveling along the magnetic field 
                         lines, from higher to lower latitudes, and the likely contribution 
                         of these particles to the ionization measured as an absorption of 
                         the cosmic noise in the lower ionosphere.",
                  doi = "10.1016/j.jastp.2011.01.010",
                  url = "http://dx.doi.org/10.1016/j.jastp.2011.01.010",
                 issn = "1364-6826",
             language = "en",
           targetfile = "Costa_interplanetary.pdf",
        urlaccessdate = "16 jun. 2024"
}