Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...251..339l&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 251, no. 1, Nov. 1991, p. 339-348.
Astronomy and Astrophysics
Astrophysics
38
Io, Jupiter (Planet), Magnetic Storms, Planetary Magnetospheres, Polarization (Waves), Radio Emission, Magnetic Field Configurations, Planetary Magnetic Fields, Radio Spectra, Stokes Law Of Radiation
Scientific paper
A radio burst from Io-A and one from Io-B are reported with Stokes polarimetry observations as a function of both frequency and time. A spectropolarimeter was employed to detect the bursts which was fed by two antenna arrays of 72 elements that were oppositely polarized. The radiation is found to be 100-percent elliptically polarized at all measured frequencies, and the Io-B event is basically linear with constant linear and circular polarization. The radiation from the Io-A event is more circular, and fringes due to Faraday rotation are reported in the dynamic spectra of Q, U, and an orientation of the polarization ellipse. The major axis of the polarization ellipse of both bursts is found to be somewhat aligned with the magnetic field direction in the expected source region, and three possible explanations for this unusual phenomenon are posited.
Boischot Andre
Boudjada Mohammed Y.
Dulk George A.
Lecacheux Alain
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