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Latitudinal beaming of Jupiter's low frequency radio emissions

Authors :
James R. Thieman
Michael D. Desch
M. L. Kaiser
J. K. Alexander
Source :
Journal of Geophysical Research. 84:5167
Publication Year :
1979
Publisher :
American Geophysical Union (AGU), 1979.

Abstract

By comparing RAE-1 and IMP-6 satellite measurements of Jupiter's radio emission near 1MHz with recent Voyager-1 and 2 observations in the same frequency range, the properties of the low frequency radiation pattern over a 10 deg range of latitudes with respect to the Jovian rotation equator can be studied. These observations, which cover a wider latitudinal range than is possible from the earth, are consistent with many aspects of earlier ground-based measurements used to infer a sharp beaming pattern for the decameter wavelength emissions. Marked, systematic changes are found in the statistical occurrence probability distributions with system 3 central meridian longitude as the jovigraphic latitude of the observer changes over this range. Simultaneous observations by the two Voyager spacecraft suggest that the instantaneous beam width may be no more than a few degrees at times. The new hectometer-wave results can be interpreted in terms of a narrow, curved sheet at a fixed magnetic latitude into which the emission is beamed to escape the planet.

Details

ISSN :
01480227
Volume :
84
Database :
OpenAIRE
Journal :
Journal of Geophysical Research
Accession number :
edsair.doi...........0612b7591260f7b838588a6d9f6f59ce
Full Text :
https://doi.org/10.1029/ja084ia09p05167