Physics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm53b1281m&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SM53B-1281
Physics
6219 Io, 6939 Magnetospheric Physics (2700), 7534 Radio Emissions, 7815 Electrostatic Structures, 7845 Particle Acceleration
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 cyclotron-maser 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 regions where 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.
Hess Sebastian
Mottez Fabrice
Zarka Ph.
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