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Impulsive solar wind-driven emission from UranusSeveral days prior to the Voyager spacecraft encounter with Uranus, the plasma wave and radio astronomy receivers detected extraordinarily narrowband bursty signals, the first indication of any radio emission from the planet. The characteristics of these signals were so unusual that their identity as a natural planetary emission was questioned at first. Subsequent analysis has shown, however, that the n bursts are modulated at the 17.24-hour Uranus rotation period and are, therefore, planetary in origin. It is shown, in addition, that the typical bandwidth and time scale for the bursts are about 5 kHz and 250 ms, respectively. The phase of the rotation modulation suggests a probable source for these events in the vicinity of the north (weak) magnetic pole. The waves are right-hand polarized and are therefore emitted in the extraordinary magnetoionic mode if the emission in fact originates above the north magnetic pole.
Document ID
19890051532
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Desch, M. D.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Kaiser, M. L.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Kurth, W. S.
(Iowa, University Iowa City, United States)
Date Acquired
August 14, 2013
Publication Date
May 1, 1989
Publication Information
Publication: Journal of Geophysical Research
Volume: 94
ISSN: 0148-0227
Subject Category
Lunar And Planetary Exploration
Accession Number
89A38903
Funding Number(s)
CONTRACT_GRANT: JPL-957723
Distribution Limits
Public
Copyright
Other

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