Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3513107h&link_type=abstract
Geophysical Research Letters, Volume 35, Issue 13, CiteID L13107
Astronomy and Astrophysics
Astronomy
15
Magnetospheric Physics: Magnetosphere Interactions With Satellites And Rings, Planetary Sciences: Solar System Objects: Jupiter, Planetary Sciences: Solar System Objects: Io, Magnetospheric Physics: Plasma Waves And Instabilities (2471), Radio Science: Radio Astronomy
Scientific paper
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 <=1°. The lead angle is found between a few degrees and ~40° in both hemispheres. Resonant electron energies are about a few keV. Implications on the absence of a plasma cavity at IFT footprints and on Jupiter's internal magnetic field model are discussed.
Cecconi Baptiste
Hess Sebastian
Zarka Ph.
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