Linear polarization observations of Jupiter at 6, 11 and 21 CM wavelengths

Details Linear polarization observations of Jupiter at 6, 11 and 21 CM wavelengths Linear polarization observations of Jupiter at 6, 11 and 21 CM wavelengths

Sep 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....60..369g&link_type=abstract

Astronomy and Astrophysics, vol. 60, no. 3, Sept. 1977, p. 369-375.

Astronomy and Astrophysics

Astrophysics

8

Decimeter Waves, Jupiter (Planet), Linear Polarization, Planetary Radiation, Planetary Rotation, Astronomical Models, Magnetic Anomalies, Magnetic Dipoles, Magnetic Field Configurations, Pioneer 11 Space Probe, Planetary Magnetic Fields, Radiant Flux Density

Scientific paper

Results are presented for linear-polarization and total-intensity observations of Jupiter performed at wavelengths of 6, 11, and 21 cm during seven periods when the inclination of the planet's rotational axis to the plane of the sky was near its peak negative value of -3 deg. It is found that the apparent inclination of the Jovian dipole increases with increasing wavelength, the polarized flux density decreases with decreasing wavelength, and the observed variations in both the direction of polarization and the polarized flux density with Jovian rotation deviate from the predictions for a simple inclined-dipole model of the planet's magnetic field. Two deviations (a second harmonic in the position-angle variation and unequal maxima in the polarized-flux-density variation) are discussed which cannot easily be explained in terms of either a localized magnetic-field anomaly or a field configuration similar to that suggested by Pioneer 11 measurements. The results are shown to confirm previous evidence for a high-frequency cutoff in the polarized flux density near 6 cm.

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