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Observations of electron gyroharmonic waves and the structure of the Io torusNarrow-banded emissions observed by the planetary radio astronomy experiment on the Voyager 1 spacecraft as it traversed the Io plasma torus are discussed. It is found that the waves occur between harmonics of the electron gyrofrequency; they are Jovian analogue of electrostatic emissions observed and theoretically studied for the terrestrial magnetosphere. It is noted that the observed frequencies always include the component near the upper hybrid resonant frequency but that the distribution of the other observed emissions varies in a systematic way with position in the torus. A detailed discussion of the observations is given. Also included is a refined model of the electron density variation, based on identification of the upper hybrid resonant frequency line.
Document ID
19820028816
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Birmingham, T. J.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Alexander, J. K.
(NASA Goddard Space Flight Center Laboratory for Extraterrestrial Physics, Greenbelt, MD, United States)
Desch, M. D.
(Maryland, University College Park, MD, United States)
Hubbard, R. F.
(JAYCOR Alexandria, VA, United States)
Pedersen, B. M.
(Paris, Observatoire, Meudon Hauts-de-Seine, France)
Date Acquired
August 10, 2013
Publication Date
September 30, 1981
Publication Information
Publication: Journal of Geophysical Research
Volume: 86
Subject Category
Lunar And Planetary Exploration
Accession Number
82A12351
Distribution Limits
Public
Copyright
Other

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