Modelling of Io-Jupiter decameter arcs, emission beaming and energy source

Details Modelling of Io-Jupiter decameter arcs, emission beaming and energy source Modelling of Io-Jupiter decameter arcs, emission beaming and energy source

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm53a1087z&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SM53A-1087

Physics

6219 Io, 6939 Magnetospheric Physics (2700), 7534 Radio Emissions, 7815 Electrostatic Structures, 7845 Particle Acceleration

Scientific paper

The electrodynamic interaction between Io and Jupiter is known to lead to accelerated electrons in/near the Io flux tube. These electrons produce intense radio emissions in the hecto-decameter range, with specific arc shapes in the time-frequency plane depending on the hemisphere of origin of the emission and on the Io-Jupiter- observer geometry. Assuming radio wave generation by the cyclotron-maser instability and a Jovian magnetic field model, we simulate tf arc shapes as a function of the radio emission beaming and of the lead angle between the radio emitting field line and the instantaneous Io field line. An excellent fit is obtained for loss-cone driven emission, obliquely beamed in a hollow cone at ~70 degrees from the source magnetic field within a ~1 degree thick beam. The radio beaming angle obtained from our simulations is found to be consistent with empirically fitted beaming angle function, assuming a supplementary refraction effect in the dense regions of the Io flux tube. The lead angle giving the best fit is ~30 degrees in both hemispheres, not fully consistent with the propagation of the perturbation generated by Io via Alfven waves. Simulation of future Juno radio observations are briefly discussed.

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