Occurrence probability of jovian decameter radio emissions: Theoretical evidence of active longitude

Details Occurrence probability of jovian decameter radio emissions: Theoretical evidence of active longitude Occurrence probability of jovian decameter radio emissions: Theoretical evidence of active longitude

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....6126g&link_type=abstract

EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #6126

Mathematics

Probability

Scientific paper

Long term ground observations of the jovian decameter radio emission reveal that the occurrence probability of the radiation depends on the central meridian longitude (CML, System III) and the orbital phase of Io. Four regions of enhanced occurrence are present in the CML-Io phase diagram: they make up the ``Io-controlled radio sources''. We propose a theoretical interpretation for the control of the sources by the jovian longitude based on the efficiency of the cyclotron maser instability mechanism, which is supposed to be at the origin of most planetary radio emissions. We suppose that electrons are accelerated in the neighbourhood of Io and follow an adiabatic motion along magnetic field lines carried by the satellite. The loss cone built up by electrons which have disappeared in Jupiter's ionosphere constitutes the source of free energy needed by the cyclotron maser instability. We calculate the maximum growth rate of the waves amplified by this mechanism as a function of the jovicentric longitude of Io, in order to determine emission zones presenting a high occurrence probability. The results are compared to the occurrences observed for the sources in the CML-Io phase diagram.

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