Computer Science
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja....13161z&link_type=abstract
EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #13161
Computer Science
Scientific paper
Jupiter emits intense decameter radio waves, detectable from the ground in the range ~10 to 40 MHz. They are produced by energetic electron precipitations in its auroral regions, as well as near the magnetic footprints of the galilean satellite Io. Radio imaging imaging of these decameter emissions with arcsecond angular resolution and millisecond time resolution should give access to: - an improved mapping of the surface planetary magnetic field, deduced from the highest frequency of radio emission coming from a given point above the ionosphere (emission is produced at the local electron cyclotron frequency, proportional to the magnetic field amplitude) ; - detailed information on the Io-Jupiter electrodynamic interaction: imaging will allow to measure the angle between the field line instantaneously threading through Io and the one(s) emitting radio waves at that time, which is a strong constraint of the interaction mechanism (current circuit or Alfvèn waves) ; when performed at millisecond time resolution, imaging should allow to "see" the electron bunches thought to be at the origin of the sporadic drifting decameter bursts, and to follow them along magnetic field lines, measuring thus their speed and energy, and revealing possible electric potential drops along magnetic field lines ; - correlation of radio images with ultraviolet and infrared images of the aurora as well as of the galilean satellite footprints will provide complementary information on the precipitated energy and an interesting input to magnetospheric dynamics ; - imaging of decameter radio sources through the Io plasma torus will allow to probe for the first time the torus electron density as a function of longitude through analysis of the Faraday rotation of decameter waves crossing the torus ; diffraction effects that may be at the origin of observed fringe patterns could also be studied. Very fast imaging should be allowed by the very high intensity of Jovian decameter bursts, up to several million Jansky as seen from the Earth.
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