HR: 0800h
AN: SM51A-0276    [Abstracts]
TI: Io-Jupiter interaction : field aligned potentials revealed by S-bursts analysis
AU: * Hess, S
EM: sebastien.hess@obspm.fr
AF: LUTH, Observatoire de Paris, CNRS, Universite Paris Diderot, 5 Place Jules Janssen, Meudon, 92190, France
AU: * Hess, S
EM: sebastien.hess@obspm.fr
AF: LESIA, Observatoire de Paris, CNRS, UPMC, Universite Paris Diderot, 5 Place Jules Janssen, Meudon, 92190, France
AU: Zarka, P
EM: philippe.zarka@obspm.fr
AF: LESIA, Observatoire de Paris, CNRS, UPMC, Universite Paris Diderot, 5 Place Jules Janssen, Meudon, 92190, France
AU: Mottez, F
EM: fabrice.mottez@obspm.fr
AF: LUTH, Observatoire de Paris, CNRS, Universite Paris Diderot, 5 Place Jules Janssen, Meudon, 92190, France
AB: Jovian millisecond (or S-)bursts are intense impulsive Jovian decametric radiations drifting in frequency in tens of milliseconds. Most of the theories about their origin focus on the frequency drift and suggest that S-bursts are cyclotron-maser emission in the flux tube connecting Io's wake to Jupiter. We have performed an automated analysis of high resolution dynamic spectra of S-bursts, from Karkov and Nançay decametric radio telescopes. The analysis of our data show that it is consistent with the above scenario. We find a typical energy of 4 keV for the emitting electrons. But we can go beyhond this scenario: reformulate the adiabatic model including parallel electric fields, and search for correspondig signatures in the data. A statistical analysis suggests the existence of stable localized potential jumps of about 1 keV. Using the Karkov radiotelescope data, the stability and the velocity of these structures is analysed.
DE: 6219 Io
DE: 6939 Magnetospheric physics (2700)
DE: 7534 Radio emissions
DE: 7815 Electrostatic structures
DE: 7845 Particle acceleration
SC: SPA-Magnetospheric Physics [SM]
MN: 2007 Fall Meeting