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Neptune radio emission in dipole and multipole magnetic fieldsWe study Neptune's smooth radio emission in two ways: we simulate the observations and we then consider the radio effects of Neptune's magnetic multipoles. A procedure to deduce the characteristics of radio sources observed by the Planetary Radio Astronomy experiment minimizes limiting assumptions and maximizes use of the data, including quantitative measurement of circular polarization. Study of specific sources simulates time variation of intensity and apparent polarization of their integrated emission over an extended time period. The method is applied to Neptune smooth recurrent emission (SRE). Time series are modeled with both broad and beamed emission patterns, and at two frequencies which exhibit different time variation of polarization. These dipole-based results are overturned by consideration of more complex models of Neptune's magnetic field. Any smooth emission from the anticipated auroral radio source is weak and briefly observed. Dominant SRE originates complex fields at midlatitude. Possible SRE source locations overlap that of 'high-latitude' emission (HLE) between +(out) and -(in) quadrupoles. This is the first identification of multipolar magnetic structure with a major source of planetary radio emission.
Document ID
19950063954
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Sawyer, C. B.
(Radiophysics, Incorporated Boulder, CO, United States)
King, N. V.
(Radiophysics, Incorporated Boulder, CO, United States)
Romig, J. H.
(Radiophysics, Incorporated Boulder, CO, United States)
Warwick, J. W.
(Radiophysics, Incorporated Boulder, CO, United States)
Date Acquired
August 17, 2013
Publication Date
July 1, 1995
Publication Information
Publication: Journal of Geophysical Research
Volume: 100
Issue: A7
ISSN: 0148-0227
Subject Category
Astronomy
Accession Number
95A95553
Funding Number(s)
CONTRACT_GRANT: JPL-959194
CONTRACT_GRANT: NAGW-4697
Distribution Limits
Public
Copyright
Other

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