@Article{EcherBolz:2016:CoStSo,
author = "Echer, Ezequiel and Bolzam, Maur{\'{\i}}cio J. A.",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and
{Universidade Federal de Goi{\'a}s (UFGO)}",
title = "A comparative study of solar wind and foreshock turbulence near
Uranus orbit",
journal = "Planetary and Space Science",
year = "2016",
volume = "120",
pages = "70--77",
month = "Jan.",
keywords = "Foreshock waves, Uranus magnetosphere, Solar wind turbulence.",
abstract = "In this work we have used statistical and wavelet techniques to
characterize some properties from the Uranus foreshock and the
nearby background solar wind. Results of the wavelet spectra
showed that the dominant waves have common periodicities at
similar to 12 min, similar to 31 min and similar to 65 min for
both the background and foreshock regions. However, the average
wave power for the foreshock interval was about 10 times higher
than for the background solar wind. These common periods found
both in the foreshock and solar wind may be an indicative of the
nature of the turbulent flow at this distance from the Sun. The
foreshock to background magnetic field variance ratio is about
3.0. Minimum variance results show that most of waves have a
compression factor of 0.65 and propagate obliquely to the magnetic
field direction. The main period found at similar to 10-15 min is
close to the frequency observed for upstream waves based on
observations of other planets and that are interpreted in terms of
ion cyclotron resonance. Results from kurtosis parameter showed a
Gaussian behavior indicating there is no significant intermittent
physical processes acting over these components in the background
solar wind. Further, over larger scales, some components presented
a sub-Gaussian behavior, possibly associated to quasi-periodic
waves with finite amplitudes.",
doi = "10.1016/j.pss.2015.11.008",
url = "http://dx.doi.org/10.1016/j.pss.2015.11.008",
issn = "0032-0633",
language = "en",
targetfile = "echer_comparative.pdf",
urlaccessdate = "27 abr. 2024"
}