Fechar
Metadados

@Article{KlausnerdeOliveiraDoMeCoRoOj:2016:CaStUs,
               author = "Klausner de Oliveira, Virg{\'{\i}}nia and Domingues, Margarete 
                         Oliveira and Mendes, Odim and Costa, Aracy Mendes da and Rodriguez 
                         Papa, Andres Reinaldo and Ojeda Gonzalez, Arian",
          affiliation = "{Universidade do Vale do Para{\'{\i}}ba (UNIVAP)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)} and {Instituto Nacional de Pesquisas 
                         Espaciais (INPE)} and {Observat{\'o}rio Nacional (ON)} and 
                         {Universidade do Vale do Para{\'{\i}}ba (UNIVAP)}",
                title = "Latitudinal and longitudinal behavior of the geomagnetic field 
                         during a disturbed period: a case study using wavelet techniques",
              journal = "Advances in Space Research",
                 year = "2016",
               volume = "58",
               number = "10",
                pages = "2148--2163",
                month = "Nov.",
             keywords = "Energy injection, October 1822, 1998 geomagnetic storm, Vassouras 
                         observatory, Wavelet techniques.",
             abstract = "Coronal mass ejections are the primary cause of the highly 
                         disturbed conditions observed in the magnetosphere. Momentum and 
                         energy from the solar wind are transferred to the Earth's 
                         magnetosphere mainly via magnetic reconnection which produces open 
                         field lines connecting the Earth magnetic field to the solar wind. 
                         Magnetospheric currents are coupled to the ionosphere through 
                         field-aligned currents. This particular characteristic of the 
                         magnetosphereionosphere interconnection is discussed here on the 
                         basis of the energy transfer from high (auroral currents) to 
                         low-latitudes (ring current). The objective of this work is to 
                         examine how the conditions during a magnetic storm can affect the 
                         global space and time configuration of the ring current, and, how 
                         these processes can affect the region of the South Atlantic 
                         Magnetic Anomaly. The H- or X-components of the Earth's magnetic 
                         field were examined using a set of six magnetometers approximately 
                         aligned around the geographic longitude at about 10,140 and 295 
                         from latitudes of 70N to 70S and aligned throughout the 
                         equatorial region, for the event of October 1822, 1998. The 
                         investigation of simultaneous observations of data measured at 
                         different locations makes it possible to determine the effects of 
                         the magnetosphereionosphere coupling, and, it tries to establish 
                         some relationships among them. This work also compares the 
                         responses of the aligned magnetic observatories to the responses 
                         in the South Atlantic Magnetic Anomaly region. The major 
                         contribution of this paper is related to the applied methodology 
                         of the discrete wavelet transform. The wavelet coefficients are 
                         used as a filter to extract the information in high frequencies of 
                         the analyzed magnetogram. They also better represent information 
                         about the injections of energy and, consequently, the disturbances 
                         of the geomagnetic field measured on the ground. As a result, we 
                         present a better way to visualize the correlation between the X- 
                         or H-components. In the latitude range from \∼40S to 
                         \∼60N, the wavelet signatures do not show remarkable 
                         differences, except for the amplitudes of the wavelet 
                         coefficients. The sequence of transient field variations detected 
                         at auroral latitudes is probably associated to occurrences of 
                         substorms, while at lower latitudes, these variations are 
                         associated to the enhancement of the ring current.",
                  doi = "10.1016/j.asr.2016.01.018",
                  url = "http://dx.doi.org/10.1016/j.asr.2016.01.018",
                 issn = "0273-1177 and 1879-1948",
             language = "en",
           targetfile = "klausner_latitudinal.pdf",
        urlaccessdate = "27 nov. 2020"
}


Fechar