An interpretation of the broadband VLF waves near the Io torus as observed by ULYSSES

Details An interpretation of the broadband VLF waves near the Io torus as observed by ULYSSES An interpretation of the broadband VLF waves near the Io torus as observed by ULYSSES

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9821177f&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A12, p. 21,177-21,188

Astronomy and Astrophysics

Astronomy

15

Broadband, Electron Plasma, Io, Plasma Frequencies, Radio Waves, Spaceborne Astronomy, Toroidal Plasmas, Very Low Frequencies, Plasma Density, Radio Astronomy, Radio Emission, Space Plasmas, Toruses, Ulysses Mission, Whistlers

Scientific paper

The requirements for the Ulysses trajectory to attain high ecliptic latitudes using a Jovian gravitational assist resulted in a fortuitous passage through the Io torus region. Specifically, the spacecraft spent many hours at latitudes just above the torus. During this time the low-frequency cutoff of an ordinary mode (O mode) emission allowed a determination of the local electron plasma frequency (i.e., electron density) along the northern flank of the torus. Also, near a Jovian System III longitude of 100 deg, the spacecraft flew past a set of active field lines that have been previously identified to be associated with the hectometric generation region. During the passage, Ulysses observed a newly discovered O mode component and a whistler mode emission similar to that observed by Voyager 1 13 years previously. All of the broadband VLF emissions imply the presence of a particular population of electrons. We suggest that broadband VLF emissions can be used as a `particle detector' to qualitatively measure the electron plasma conditions in the torus region and identify active regions.

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