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The emission of narrow-band Jovian kilometric radiationA model based on the nonlinear coupling of electrostatic plasma waves is proposed to explain the emission of the narrow-band Jovian kilometric radiation (nKOM) observed by the Voyager spacecraft. It is shown that upper-hybrid branch electrostatic waves propagating through the inhomogeneities in the outer periphery of the Io plasma torus can attain the proper geometry for localized upconversion interactions leading to pump depletion. Plasma waves propagating into a weak density gradient and reflected at the critical layer interact with the incident waves leading to the electromagnetic emission, which is beamed at large angles with respect to the background magnetic field. In general, both L-O and R-X mode waves can be generated. The observed power and net polarization (L-O) are consistent with pump depletion of electrostatic waves at a level of about 10 mV/m. A possible excitation mechanism for the electrostatic waves is also discussed.
Document ID
19870064420
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Fung, S. F.
(NASA Goddard Space Flight Center Greenbelt; ORI, Inc., Landover, MD, United States)
Papadopoulos, K.
(Maryland, University College Park, United States)
Date Acquired
August 13, 2013
Publication Date
August 1, 1987
Publication Information
Publication: Journal of Geophysical Research
Volume: 92
ISSN: 0148-0227
Subject Category
Lunar And Planetary Exploration
Accession Number
87A51694
Funding Number(s)
CONTRACT_GRANT: NAS5-29312
CONTRACT_GRANT: NAGW-81
Distribution Limits
Public
Copyright
Other

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