Abstract
The Voyager Planetary Radio Astronomy (PRA) 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 ∼90°. The spacings between adjacent PRA arcs, and also between adjacent S burst arc segments observed at the Nançay Observatory, were analyzed and found to be so brief, less than 1–3 min, that either these currents and any associated Alfvén 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 Alfvén current can radiate at several different cone angles simultaneously (a hypothesis independently supported by the observation of such behavior in the S burst arcs).
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