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Possible second harmonic gyroemission at UranusDuring the inbound trajectory toward Uranus, the Planetary Radio Astronomy Instrument on board the Voyager 2 spacecraft observed narrow-band smooth (n-smooth) emission at frequencies centered near 60 kHz. By assuming models of the plasma density for the dayside magnetosphere of Uranus and by using cold plasma theory together with stringent observational constraints, ray-tracing calculations were performed to determine the source location and mode of the n-smooth emission. Ray-tracing calculations suggest that the n-smooth emission with sources near the magnetic equator may be fundamental X mode for certain conditions or second harmonic gyroemission. If the emission is second harmonic gyroemission, the fundamental emission at 30 kHz is expected but apparently not observed. These findings are discussed in the context of the most recent developments in the theory of the cyclotron maser instability.
Document ID
19910034354
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Menietti, J. D.
(Southwest Research Inst. San Antonio, TX, United States)
Curran, D. B.
(Southwest Research Institute San Antonio, TX, United States)
Date Acquired
August 15, 2013
Publication Date
December 1, 1990
Publication Information
Publication: Journal of Geophysical Research
Volume: 95
ISSN: 0148-0227
Subject Category
Lunar And Planetary Exploration
Accession Number
91A18977
Funding Number(s)
CONTRACT_GRANT: NAGW-1205
Distribution Limits
Public
Copyright
Other

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