Moon-Planet and Exoplanet-Star Couplings: Common Electrodynamic Interaction Mechanisms Throughout the Universe

Details Moon-Planet and Exoplanet-Star Couplings: Common Electrodynamic Interaction Mechanisms Throughout the Universe Moon-Planet and Exoplanet-Star Couplings: Common Electrodynamic Interaction Mechanisms Throughout the Universe

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm11c1774s&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM11C-1774

Physics

[2704] Magnetospheric Physics / Auroral Phenomena, [2732] Magnetospheric Physics / Magnetosphere Interactions With Satellites And Rings, [6218] Planetary Sciences: Solar System Objects / Jovian Satellites, [6296] Planetary Sciences: Solar System Objects / Extra-Solar Planets

Scientific paper

Planetary bodies throughout the universe are commonly exposed to the flow of magnetized plasma. If the relative velocity between the plasma flow and the planetary body is slower than the Alfven velocity, i.e. if the flow is sub-Alfvenic, then momentum and energy can be transported in the upstream direction of the flow and reach the parent planet or the parent star. Such a coupling is observed at Io, Europa, Ganymede, and Enceladus in form of auroral footprints and electron beams near the satellites. But there is also observational evidence for footprints of extra solar planets on their central stars when the exoplanets are sufficiently close to their central stars. In our presentation we will review the common physics and the differences of these electrodynamic coupling mechanisms at exoplanets and planetry moons with special focus on the energetics of the interaction.

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