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Effectiveness of Near-Grazing Incidence Reflection in Creating the Rotationally Modulated Lanes in the Jovian Hectometric Radio Emission SpectrumThe Galileo plasma wave instrument has identified a narrow (in frequency) attenuation band in the hectometric emission that varies in frequency with system 3 longitude. It is possible to model this emission band assuming a high-latitude cyclotron source region with emission that is efficiently attenuated when the ray path is nearly tangent to an L shell that is close to the Io flux tube. The data suggest that the mechanism for attenuating the emission is very efficient, with the ratio of attenuated to unattenuated emission I/I(sub o) < 0.02, and not a strong function of frequency. In this paper we demonstrate that incoherent scattering alone cannot explain the attenuation lane, which does not preclude coherent scattering by uncertain processes. We find rather that the source of attenuation is consistent with near-grazing incidence reflection of emission from an L shell that is near the Io flux tube (a caustic surface).
Document ID
20020030300
Acquisition Source
Jet Propulsion Laboratory
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Menietti, J. D.
(Iowa Univ. Iowa City, IA United States)
Gurnett, D. A.
(Iowa Univ. Iowa City, IA United States)
Kurth, W. S.
(Iowa Univ. Iowa City, IA United States)
Groene, J. B.
(Iowa Univ. Iowa City, IA United States)
Date Acquired
August 20, 2013
Publication Date
July 1, 1999
Publication Information
Publication: Radio Science
Publisher: American Geophysical Union
Volume: 34
Issue: 4
ISSN: 0048-6604
Subject Category
Lunar And Planetary Science And Exploration
Report/Patent Number
Paper-1999RS900036
Funding Number(s)
CONTRACT_GRANT: JPL-958779
Distribution Limits
Public
Copyright
Other

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