Power transmission and particle acceleration along the Io flux tube

Details Power transmission and particle acceleration along the Io flux tube Power transmission and particle acceleration along the Io flux tube

Jun 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jgra..11506205h&link_type=abstract

Journal of Geophysical Research, Volume 115, Issue A6, CiteID A06205

Physics

11

Magnetospheric Physics: Magnetosphere Interactions With Satellites And Rings, Magnetospheric Physics: Energetic Particles: Precipitating, Magnetospheric Physics: Auroral Phenomena (2407), Magnetospheric Physics: Field-Aligned Currents And Current Systems (2409), Magnetospheric Physics: Numerical Modeling

Scientific paper

Io's motion relative to the Jovian magnetic field generates a power of about 1012 W, which is thought to propagate as an Alfvén wave along the magnetic field line. This power is transmitted to the electrons, which will then precipitate and generate the observed auroral phenomena from UV to radio wavelengths. A more detailed look at this hypothesis shows some difficulties: Can the Alfvén waves escape the torus or are they trapped inside? Where and how are the particles accelerated? In which direction? Is there enough power transmitted to the particles to explain the strong brightness of the auroral emissions in UV, IR, visible, and radio? In other words, can we make a global, consistent model of the Io-Jupiter interaction that matches all the observations? To answer these questions, we review the models and studies that have been proposed so far. We show that the Alfvén waves need to be filamented by a turbulent cascade process and accelerate the electrons at high latitude in order to explain the observations and to form a consistent scheme of the Io-Jupiter interaction.

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