Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9611441o&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 96, July 1, 1991, p. 11,441-11,453.
Astronomy and Astrophysics
Astronomy
19
Jupiter (Planet), Planetary Radiation, Radio Emission, Low Frequencies, Nonthermal Radiation, Polarized Electromagnetic Radiation
Scientific paper
The polarization properties of the Jovian hectometric (HOM) emission observed in the low-frequency band 1.2-1326 kHz by the planetary radio astronomy (PRA) experiment aboard the Voyager spacecraft have been studied. It is shown that the complex morphology of HOM can be explained by simultaneous radiations from two independent 100 percent oppositely polarized sources. Analysis of data recorded under different antenna-source configurations indicates that the existence of a linear component in HOM is very unlikely. It is shown that the apparent degree of circular polarization measured by the PRA instrument, which practically ranges from -1 to +1, is the result of fluctuations in the relative intensities of the two HOM circular components. A global model for the hectometric and decametric (DAM) Jovian emissions in which the left and right HOM components are identified with the left and right non-Io DAM components, respectively, is outlined.
Lecacheux Alain
Ortega-Molina Arturo
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