@Article{ZarkaMaLoRyLaEcCe:2018:JuRaEm,
author = "Zarka, P. and Marques, M. S. and Louis, C. and Ryabov, V. B. and
Lamy, L. and Echer, Ezequiel and Cecconi, B.",
affiliation = "LESIA, Observatoire de Paris and LESIA, Observatoire de Paris and
LESIA, Observatoire de Paris and {Future University Hakodate} and
LESIA, Observatoire de Paris and {Instituto Nacional de Pesquisas
Espaciais (INPE)} and LESIA, Observatoire de Paris",
title = "Jupiter radio emission induced by Ganymede and consequences for
the radio detection of exoplanets",
journal = "Astronomy \& Astrophysics",
year = "2018",
volume = "618",
number = "A84",
month = "Oct.",
keywords = "radio continuum: planetary systems, plasmas, magnetic fields,
planet-star interactions, planets and satellites: individuals:
Jupiter, Ganymede, Io, catalogs.",
abstract = "By analysing a database of 26 yr of observations of Jupiter with
the Nancay Decameter Array, we unambiguously identify the radio
emissions caused by the Ganymede-Jupiter interaction. We study the
energetics of these emissions via the distributions of their
intensities, duration, and power, and compare them to the
energetics of the Io-Jupiter radio emissions. This allows us to
demonstrate that the average emitted radio power is proportional
to the Poynting flux from the rotating Jupiter's magnetosphere
intercepted by the obstacle. We then generalize this result to the
radio-magnetic scaling law that appears to apply to all plasma
interactions between a magnetized flow and an obstacle, magnetized
or not. Extrapolating this scaling law to the parameter range
corresponding to hot Jupiters, we predict large radio powers
emitted by these objects, that should result in detectable radio
flux with new-generation radiotelescopes. Comparing the
distributions of the durations of Ganymede-Jupiter and Io-Jupiter
emission events also suggests that while the latter results from
quasi-permanent Alfven wave excitation by Io, the former likely
results from sporadic reconnection between magnetic fields
Ganymede and Jupiter, controlled by Jupiter's magnetic field
geometry and modulated by its rotation.",
doi = "10.1051/0004-6361/201833586",
url = "http://dx.doi.org/10.1051/0004-6361/201833586",
issn = "0004-6361 and 1432-0746",
language = "en",
targetfile = "zarka_jupiter.pdf",
urlaccessdate = "05 maio 2024"
}