@Article{HessEchZarLamDel:2014:MuStJo,
author = "Hess, S. L. G. and Echer, Ezequiel and Zarka, P. and Lamy, L. and
Delamere, P. A.",
affiliation = "LESIA, Observatoire de Paris, Universit{\'e} Paris Diderot and
{Instituto Nacional de Pesquisas Espaciais (INPE)} and LESIA,
Observatoire de Paris, Universit{\'e} Paris Diderot and LESIA,
Observatoire de Paris, Universit{\'e} Paris Diderot and
{University of Alaska}",
title = "Multi-instrument study of the Jovian radio emissions triggered by
solar wind shocks and inferred magnetospheric subcorotation
rates",
journal = "Planetary and Space Science",
year = "2014",
volume = "99",
pages = "136--148",
keywords = "Magnetosphere, Radio astronomy, Solar wind, Spacecraft, Storms,
Jovian radio arcs, Jupiter-Io interaction, Magnetospheric
dynamics, Shocks, Subcorotation, Interplanetary flight.",
abstract = "The influence of solar wind conditions on the Jovian auroral radio
emissions has long been debated, mostly because it has always been
difficult to get accurate solar wind and radio observations at the
same time. We present here a study of Jupiter's radio emissions
compared to solar wind conditions using radio (RPWS) and magnetic
(MAG) data from the Cassini spacecraft from October to December
2000, just before its flyby of Jupiter. The spacecraft was then in
the solar wind and could record both the radio emissions coming
from the Jovian magnetosphere and the solar wind magnetic field
(IMF). With these data, we found a good correspondence between the
arrival of interplanetary shocks at Jupiter and the occurrence of
radio storms. Our results confirm those from the previous studies
showing that fast forward shocks (FFS) trigger mostly dusk
emissions, whereas fast reverse shocks (FRS) trigger both dawn and
dusk emissions. FFS-triggered emissions are found to occur 10-30 h
after the shock arrival when the IMF is weak (below 2 nT), and
quasi-immediately after shock arrival when the IMF is strong
(above 2 nT). FRS-triggered emissions are found to occur
quasi-immediately even when the IMF is weak. We show and discuss
in depth the characteristic morphologies of the radio emissions
related to each type of shock and their implications. We also used
simultaneous radio observations from the ground-based
Nan{\c{c}}ay decameter array and from the Galileo radio
instrument (PWS). From the comparison of these measurements with
Cassini's, we deduce the regions where the radio storms occur, as
well as the radio source subcorotation rates. We show that
FFS-triggered emissions onset happens in a sector of local time
centered around 15:00 LT, and that all the shock-triggered radio
sources sub-corotate with a subcorotation rate of ~50% when the
IMF is below 2 nT and of ~80% when it is above 2 nT. These rates
could correspond to the extended and compressed states of the
Jovian magnetosphere. © 2014 Elsevier Ltd. All rights reserved.",
doi = "10.1016/j.pss.2014.05.015",
url = "http://dx.doi.org/10.1016/j.pss.2014.05.015",
issn = "0032-0633",
label = "scopus 2014-11 HessEchZarLamDel:2014:MuStJo",
language = "en",
targetfile = "Hess_Multiinstrument.pdf",
urlaccessdate = "27 abr. 2024"
}