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Low-frequency radio emissions in the outer heliosphereProgress is reported toward a model for the 2 and 3 kHz radio waves observed by Voyagers 1 and 2 during the 1983-1987 interval at radial distances from the sun of 17 and 13 AU, respectively. The brightness temperature and range of the volume emissivity for the radiation are calculated, and the results are compared with the characteristics of known radiation at multiples of the plasma frequency. The derived brightness temperatures are used to constrain the source of the Langmuir waves required to generate the observed emission and to rule out certain emission mechanisms. Minimum values of 3-30 micro-V/m are derived for the Langmuir wave electric field intensity and are found to be in reasonable agreement with observed values at planetary bow shocks. Path lengths required for the radiation to reach the observed levels are derived and discussed. The relevance of these ideas to possible direct observations of heliospheric boundaries is addressed.
Document ID
19910043380
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Macek, W. M.
(Iowa Univ. Iowa City, IA, United States)
Cairns, I. H.
(Iowa Univ. Iowa City, IA, United States)
Kurth, W. S.
(Iowa Univ. Iowa City, IA, United States)
Gurnett, D. A.
(Iowa, University Iowa City, United States)
Date Acquired
August 14, 2013
Publication Date
March 1, 1991
Publication Information
Publication: Journal of Geophysical Research
Volume: 96
ISSN: 0148-0227
Subject Category
Astrophysics
Accession Number
91A28003
Funding Number(s)
CONTRACT_GRANT: JPL-957723
Distribution Limits
Public
Copyright
Other

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