[en] Io's motion relative to the Jovian magnetic field generates a power of about 10^12 W, which is thought to propagate as an Alfven 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 Alfven 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 Alfven 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.
Disciplines :
Space science, astronomy & astrophysics Earth sciences & physical geography
Author, co-author :
Hess, Sebastien L G; University of Colorado at Boulder - CU > Laboratory for Atmospheric and Space Physics
Delamere, Peter; University of Colorado at Boulder - CU > Laboratory for Atmospheric and Space Physics
Dols, Vincent; University of Colorado at Boulder - CU > Laboratory for Atmospheric and Space Physics
Bonfond, Bertrand ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Swift, Daniel; University of Alaska Fairbanks > Geophysical Institute
Language :
English
Title :
Power transmission and particle acceleration along the Io flux tube
Publication date :
2010
Journal title :
Journal of Geophysical Research. Space Physics
ISSN :
2169-9380
eISSN :
2169-9402
Publisher :
American Geophysical Union (AGU), Washington, United States - District of Columbia
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