Abstract

Dynamic spectrum observations of the Jovian decametric radiation (JDR) have been carried out since 1993 at the Wakkanai Radio Observatory using a new radiospectrograph system, which covers with a frequency range from 20 to 40 MHz. The Faraday effect in JDR spectra is analyzed for two kinds of JDR events; emissions from lo-related (lo-A) source and those from non lo-related source. A significant excess of the Faraday rotation to the terrestrial contribution is disclosed by the comparison with satellite beacon measurements taken simultaneously at Wakkanai. This result suggests that the Faraday effect by the Jovian plasma cannot be neglected for both Io-A and non Io-A emissions.

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