Io-Jupiter Interaction, Millisecond Bursts and Field Aligned Potentials.

Details Io-Jupiter Interaction, Millisecond Bursts and Field Aligned Potentials. Io-Jupiter Interaction, Millisecond Bursts and Field Aligned Potentials.

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsm51a1275z&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SM51A-1275

Physics

2704 Auroral Phenomena (2407), 6219 Io, 6220 Jupiter, 7807 Charged Particle Motion And Acceleration, 7847 Radiation Processes

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 comprise an interpretation of the frequency drift. Previous analyses suggest that S-bursts are cyclotron-maser emission in the flux tube connecting Io's wake to Jupiter. In this model, electrons are accelerated from Io to Jupiter. Near Jupiter, an electron loss cone distribution appears due to a mixture of accelerated and mirror reflected adiabatic electrons. It is unstable, so that electron-cyclotron waves are amplified. We have performed an automated analysis of 230 high resolution dynamic spectra of S-bursts, providing 5.106 frequency drift measurements. Our data is fully consistent with the above scenario. In addition, we confirm with a large number of points that the frequency drift df/dt(f) is negative and smaller (in absolute value) at higher frequencies, consistent with the adiabatic theory. We find a typical energy of 4 keV for the emitting electrons. We reformulate the adiabatic model including parallel electric fields, and search for correspondig signatures in the data. A statistical analysis suggests for the first time the existence of a distributed potential drop of about 3 kV in the region of emission. In addition, we have found in 36 cases (out of 230) stable localized potential jumps of about 1 keV. These results are the first direct measurements of electric potential variations along the Io flux tube. We expect that these electric potential variations are closely connected with the existence of nearly field aligned Alfvénic currents.

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