Astronomy and Astrophysics – Astronomy
Scientific paper
May 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93.3942s&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 93, May 1, 1988, p. 3942-3948. CNES-CNRS-supported research.
Astronomy and Astrophysics
Astronomy
9
Jupiter Atmosphere, Magnetohydrodynamic Waves, Planetary Magnetic Fields, Radiant Flux Density, Radio Astronomy, Decametric Waves, Io, Planetary Ionospheres, Voyager Project, Jupiter, Decameter Waves, Currents, Voyager Missions, Pra Instrument, Radio Waves, Emissions, Intensity, Flux Tubes, Hypotheses, Analysis, Spacecraft Observations, Bursts, Gaps, Alfven Waves, Distribution
Scientific paper
The Voyager Planetary Radio Astronomy (PRAD) experiment revealed prominent 'arcs' when the radio intensity at 1-40 MHz was displayed in time-frequency coordinates. These data are consistent with multiple currents flowing along longitudinally separated Jovian magnetic flux tubes, each current radiating conically at angles up to about 90 deg. The spacings between adjacent PRA arcs, and also between adjacent S burst arc segments observed at the Nancay Observatory, were analyzed and found to be so brief, less than 1-3 min, that either these currents and any associated Alfven waves survive for at least a few circulations of Jupiter by Io (a hypothesis independently supported by the observations of arcs at all Io phase angles), or each such Alfven current can radiate at several different cone-angles simultaneously (a hypothesis independently supported by the observation of such behavior in the S burst arcs).
Garnavich Peter M.
Leblanc Yolanda
Staelin David H.
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