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Synoptic observations of Jupiter's radio emissions: Average Statistical properties observed by VoyagerObservations of Jupiter's low frequency radio emissions collected over one month intervals before and after each Voyager encounter were analyzed. Compilations of occurrence probability, average power flux density and average sense of circular polarization are presented as a function of central meridian longitude, phase of Io, and frequency. The results are compared with ground based observations. The necessary geometrical conditions are preferred polarization sense for Io-related decametric emission observed by Voyager from above both the dayside and nightside hemispheres are found to be essentially the same as are observed in Earth based studies. On the other hand, there is a clear local time dependence in the Io-independent decametric emission. Io appears to have an influence on average flux density of the emission down to below 2 MHz. The average power flux density spectrum of Jupiter's emission has a broad peak near 9MHz. Integration of the average spectrum over all frequencies gives a total radiated power for an isotropic source of 4 x 10 to the 11th power W.
Document ID
19800019784
Document Type
Preprint (Draft being sent to journal)
Authors
Alexander, J. K. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Carr, T. D. (Florida Univ. Gainesville, United States)
Thieman, J. R. (ORI Inc., Silver Springs Md., United States)
Schauble, J. J. (Florida Univ. Graduate Center Elgin AFB, United States)
Riddle, A. C. (Cooperative Inst. for Research in Environmental Science Boulder, Colo., United States)
Date Acquired
September 4, 2013
Publication Date
June 1, 1980
Subject Category
LUNAR AND PLANETARY EXPLORATION
Report/Patent Number
NASA-TM-80717
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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