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Article Dans Une Revue Geophysical Research Letters Année : 2008

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
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hal-03742133 , version 1 (19-08-2022)

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Sébastien L. G. Hess, Baptiste Cecconi, Philippe Zarka. Modeling of Io-Jupiter Decameter Arcs, Emission Beaming and Energy Source. Geophysical Research Letters, 2008, 35 (L13107), pp.1-5. ⟨10.1029/2008GL033656⟩. ⟨hal-03742133⟩
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