@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 = "Mercurys 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 = "13 maio 2024"
}