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Ulysses observations of auroral hiss at high Jovian latitudes
Author(s) -
Farrell W. M.,
MacDowall R. J.,
Desch M. D.,
Kaiser M. L.,
Stone R. G.,
Kellogg P. J.,
Lin N.,
CornilleauWehrlin N.,
Canu P.,
Bame S. J.,
Phillips J. L.
Publication year - 1993
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/93gl01120
Subject(s) - physics , whistler , hiss , jovian , jupiter (rocket family) , torus , field line , plasma , magnetosphere , geophysics , astronomy , solar wind , astrophysics , spacecraft , electron , saturn , planet , geometry , mathematics , quantum mechanics
During the Ulysses flyby of Jupiter, a whistler‐mode emission was periodically detected by the Unified Radio and Plasma wave (URAP) experiment during intervals when the spacecraft extended to high magnetic latitudes. The signal was detected between the local electron plasma frequency and lower hybrid resonance and appears as a funnel‐shaped structure on frequency‐versus‐time spectrograms; these characteristics are very reminiscent of whistler‐mode auroral hiss observed at high latitudes at Earth. Ray tracing of the emission occurrences suggests the emission source is on magnetic field lines extending out to at least 65 R J . This location associates the emission with the boundary between open and closed field lines — not the Io torus. The emission radiates about 10 7 W of power. Consequently, the auroral input power derived from the solar wind to drive the emission is believed to be 10 10‐12 W (or about 1% of the energy associated with Io torus electrical processes).