Physics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm51a0276h&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SM51A-0276
Physics
6219 Io, 6939 Magnetospheric Physics (2700), 7534 Radio Emissions, 7815 Electrostatic Structures, 7845 Particle Acceleration
Scientific paper
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.
Hess Sebastian
Mottez Fabrice
Zarka Ph.
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