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@Article{Echer:2010:WaAnUL,
               author = "Echer, Ezequiel",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)}",
                title = "Wavelet analysis of ULF waves in the Mercury's magnetosphere",
              journal = "Revista Brasileira de Geof{\'{\i}}sica",
                 year = "2010",
               volume = "28",
               number = "2",
                pages = "175--182",
             keywords = "Mercury’s magnetosphere, ULF waves, wavelet analysis. magnetosfera 
                         de MercŽurio, ondas ULF, anŽalise por ondeletas.",
             abstract = "Ultra-low-frequency (ULF) waves have been observed in the 
                         Mercury's magnetosphere. In this work, Mariner-10 and MESSENGER 
                         high resolution magnetic field data are studied with wavelet 
                         analysis. Two ULF wave intervals have been selected: 29 March 1974 
                         (Mariner-10) and 14 January 2008 (MESSENGER). Non-stationary 
                         oscillations, with strong amplitude and narrow bandwidth have been 
                         found. The Mariner-10 ULF wave interval showed periods of ~1.5-3.0 
                         s, and the MESSENGER ULF wave interval had periods of ~0.5-1.0 s. 
                         These periods of ULF waves are slightly longer than the proton 
                         gyroperiods (~0.8 and ~0.5 s, respectively). Therefore, these 
                         waves are most likely kinetic, not magnetohydrodynamic waves. 
                         RESUMO. Ondas de frequencia ultrabaixa (ULF) foram observadas na 
                         magnetosfera de MercŽurio. Neste trabalho, dados de campo 
                         magnŽetico de alta resolucžao das sondas Mariner-10 e MESSENGER 
                         sao estudados com anŽalise por ondeletas. Dois intervalos de ondas 
                         ULF foram selecionados: 29 de marcžo de 1974 (Mariner-10) e 14 de 
                         janeiro de 2008 (MESSENGER). Oscilacžoes nao estacionŽarias, de 
                         banda estreita e forte amplitude foram encontradas. As ondas ULF 
                         do intervalo da Mariner-10 tinham perŽ\ıodos entre1,5-3,0 s, 
                         e as ondas ULF do intervalo da MESSENGER tinham perŽ\ıodos 
                         de0,5-1,0 s. Esses perŽ\ıodos das ondas ULF sao ligeiramente 
                         maiores que os giro-perŽ\ıodos do prŽoton (0,8 s e0,5 s, 
                         respectivamente). Portanto, essas ondas nao sao ondas do tipo 
                         magnetohidrodinamico, mas sao provavelmente ondas do tipo 
                         cinŽetico.",
                 issn = "0102-261X",
             language = "en",
           targetfile = "v28n2a03.pdf",
        urlaccessdate = "26 jan. 2021"
}


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