Jovian Active Longitudes and Io-Controlled Decameter Radio Emissions

Details Jovian Active Longitudes and Io-Controlled Decameter Radio Emissions Jovian Active Longitudes and Io-Controlled Decameter Radio Emissions

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sf2a.conf..401g&link_type=abstract

SF2A-2006: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics Eds.: D. Barret, F. Casoli, G.

Astronomy and Astrophysics

Astrophysics

Scientific paper

In the framework of the cyclotron maser instability, supposed to be at the origin of most auroral planetary radio emissions, we have developed a model allowing a theoretical location of the Io-controlled decameter radio sources (Io-A, Io-B, Io-C and Io-D) in the central meridian longitude-Io phase diagram. We have calculated the efficiency of this theoretical mechanism at the footprint of an active magnetic field line carried away by Io during a complete revolution of the satellite around Jupiter. We make the basic hypothesis that electrons are accelerated in the neighbourhood of Io and follow an adiabatic motion along an active magnetic field line carried by the satellite. We also assume that the source of free energy needed by the cyclotron maser instability to amplify the waves derives from a loss cone distribution function built up by electrons which have disappeared in Jupiter's ionosphere. In the end we give evidence of the existence of some specific longitudes in the northern and southern hemispheres favouring the radio decameter emission and leading to a higher occurrence probability. Finally we analyse the effect of several parameters on the theoretical location of the sources in the central meridian longitude-Io phase diagram: jovicentric declination of the Earth, half-angle of the beaming cone, lead angle of the active magnetic field line and frequency of emission.

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