Other
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja....12932z&link_type=abstract
EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #12932
Other
Scientific paper
It is now known that the Io-Jupiter electrodynamic interaction results in electron precipitation and thus electromagnetic emissions near the footprints of the Io flux tube (IFT), but the detailed process of electron acceleration is not known. Due to the finite propagation time required to transport energy from low to high latitudes, and to the fact that the magnetosphere rotates faster than Io's orbital motion, the location of sources of electromagnetic emissions "lead" the instantaneous IFT by several degrees or even tens of degrees for decameter (DAM) radio emissions from the northern hemisphere. This lead angle and its variations thus contain important information on the physics of the Io-Jupiter interaction. We present the first analysis of the Nançay catalog of ~8 years of DAM observations, and derive from the maximum frequency variations of the observed radio emissions the lead angle and its variations as a function of longitude. Comparison to theoretical lead angle predictions using the best available plasma and magnetic field models allow us to identify two distinct types of Io-Jupiter radio emissions: one is linked to Alfvèn waves accelerating electrons to several keV which produce the intense radio "arcs" as well as the UV and IR spots observed near the IFT footprints ; the other - new - one, is attributed to a slow shock excited by a plasma pressure pulse at Io which ultimatey accelerates electrons to about 1 keV and produces the faint radio, UV and IR "trails" observed following the main intense emissions. This interpretation solves a long-standing controversy between radio observations and Jovian magnetic field models, as well as between radio and UV/IR observations. It sets strong constraints on Jovian magnetic field models that can be used to improve them.
Gerbault A.
Langmayr Daniel
Zarka Ph.
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