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Voyager planetary radio astronomy at NeptuneDetection of very intense short radio bursts from Neptune was possible as early as 30 days before closest approach and at least 22 days after closest approach. The bursts lay at frequencies in the range 100 to 1300 kilohertz, were narrowband and strongly polarized, and presumably originated in southern polar regions of the planet. Episodes of smooth emissions in the frequency range from 20 to 865 kilohertz were detected during an interval of at least 10 days around closest approach. The bursts and the smooth emissions can be described in terms of rotation in a period of 16.11 + or - 0.05 hours. The bursts came at regular intervals throughout the encounter, including episodes both before and after closest approach. The smooth emissions showed a half-cycle phase shift between the five episodes before and after closest approach. This experiment detected the foreshock of Neptune's magnetosphere and the impacts of dust at the times of ring-plane crossings and also near the time of closest approach. Finally, there is no evidence for Neptunian electrostatic discharges.
Document ID
19900031382
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Warwick, James W.
(Radiophysics, Inc. Boulder, CO, United States)
Evans, David R.
(Radiophysics, Inc. Boulder, CO, United States)
Peltzer, Gerard R.
(Radiophysics, Inc. Boulder, CO, United States)
Peltzer, Robert G.
(Radiophysics, Inc. Boulder, CO, United States)
Romig, Joseph H.
(Radiophysics, Inc. Boulder, CO, United States)
Sawyer, Constance B.
(Radiophysics, Inc. Boulder, CO, United States)
Riddle, Anthony C.
(Cooperative Institute for Research in the Environmental Sciences Boulder, CO, United States)
Schweitzer, Andrea E.
(Pomona College CA, United States)
Desch, Michael D.
(Radiophysics, Inc. Boulder, CO, United States)
Kaiser, Michael L.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 14, 2013
Publication Date
December 15, 1989
Publication Information
Publication: Science
Volume: 246
ISSN: 0036-8075
Subject Category
Lunar And Planetary Exploration
Accession Number
90A18437
Distribution Limits
Public
Copyright
Other

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