Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976a%26a....49..197l&link_type=abstract
Astronomy and Astrophysics, vol. 49, no. 2, June 1976, p. 197-204.
Astronomy and Astrophysics
Astronomy
8
Decametric Waves, Jupiter (Planet), Planetary Radiation, Polarized Electromagnetic Radiation, Radio Bursts, Radio Spectra, Astronomical Spectroscopy, Broadband, Faraday Effect, Frequency Distribution, Polarization Characteristics, Radio Astronomy, Spectrum Analysis
Scientific paper
The polarization of Jovian decametric radio bursts is studied by using the Faraday fringes present on four high-resolution dynamic spectra recorded over the range 27-35 MHz. Measuring the amplitude of the fringes, it is shown that the shape of the polarization ellipse changes from day to day within a given storm and depends on the frequency. From accurate measurements of the frequency of the fringes, it is proved that the high-frequency approximation generally used to determine the amount of rotation in earth's ionosphere is not valid in the present case. It is concluded that previous determinations of the polarization angle at the source must be taken with caution. This angle cannot be deduced from the observations. The previous assumption that the larger part of the Faraday rotation occurs near earth is very likely to be true, but the rotation near Jupiter may be nonzero.
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