Alfvén waves in the Io flux tube : generation of S-bursts and fine structures.

Details Alfvén waves in the Io flux tube : generation of S-bursts and fine structures. Alfvén waves in the Io flux tube : generation of S-bursts and fine structures.

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008epsc.conf..715h&link_type=abstract

European Planetary Science Congress 2008, Proceedings of the conference held 21-25 September, 2008 in Münster, Germany. Online a

Computer Science

Scientific paper

Jupiter's radio emissions are dominated in intensity by decametric radio emissions due to the Io-Jupiter interaction. Previous analyses suggest that these emissions are cyclotronmaser emissions in the flux tubes connecting Io's wake to Jupiter, triggered by electrons accelerated from Io to Jupiter. We present simulations of a hot electron population under the assumption of acceleration by Alfvén waves in the Io flux tube. Outside of limited acceleration regionswhere parallel electric field associated with Alfvén waves are found, the electrons have an adiabatic motion along the magnetic field lines. Electron distribution functions are computed at various altitudes and times (relatively to the propagation of the Alfvén wave). Near Jupiter, a loss cone appears in the magnetically mirrored electron population; it amplifies extraordinary (X) mode radio waves. The X-mode growth rate (depending on time and altitude) is computed, and a theoretical dynamic spectrum of the resulting Jovian radio emissions is built. This spectrum is compared with those made from observations. We focus this analysis on the fine structures and the occurence frequency of the S-bursts. We have also integrated electric potential jumps (strong double layers) in the numerical simulations. Their effect on the Sbursts is investigated.

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