Modeling of Io-Jupiter Decameter Arcs, Emission Beaming and Energy Source
Résumé
The electrodynamic interaction between Io and Jupiter causes electron acceleration in/near the Io flux tube (IFT), which in turn produces intense radio emissions in the hecto-decameter range, displaying arc shapes in the time-frequency plane. The shapes depend on the hemisphere of origin of the emission and on the Io-Jupiter-observer geometry. Assuming radio wave generation by the cyclotron-maser instability, we simulate t-f arc shapes as a function of emission beaming, lead angle between the radio emitting field line and the instantaneous Io field line, and electron energy. A good fit of arcs t-f location and shape is obtained for loss-cone driven (oblique) emission beamed in a hollow cone of half-angle >=80° around the source magnetic field, closing at high frequencies, and of cone thickness
Domaines
Astrophysique [astro-ph]
Fichier principal
Geophysical Research Letters - 2008 - Hess - Modeling of Io%u2010Jupiter decameter arcs emission beaming and energy source.pdf (152.68 Ko)
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