Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....61..321n&link_type=abstract
Astronomy and Astrophysics, vol. 61, no. 3, Nov. 1977, p. 321-328.
Astronomy and Astrophysics
Astrophysics
9
Jupiter (Planet), Microwave Emission, Planetary Radiation, Polarization Characteristics, Stokes Law Of Radiation, Synchrotron Radiation, Circular Polarization, Planetary Magnetic Fields, Radiant Flux Density
Scientific paper
Results are reported for measurements of the total intensity, linear polarization, position angle, and circular polarization of Jovian 11-cm radiation during one rotation of the planet. These results are shown to agree quite well with observations made one orbital period earlier when the aspect of Jupiter was nearly identical; observed changes in apparent beaming curves are attributed to the changing aspect of the planet. A comparison of observations at 11 and 21 cm indicates a possible change of about -0.05 in the spectral index. It is shown that the spectral index of the circular polarization is significantly less than 0.5 and that the dependence of the percentage circular polarization on the jovicentric magnetic latitude of earth agrees to first order with previous 21-cm measurements. It is suggested that the 11-cm radiation may originate deeper in the Jovian magnetosphere than emission at longer wavelengths, so that the effects of higher-order magnetic-fields terms are enhanced.
Biraud Francois
Booth Roy S.
Morris Dave
Neidhoefer J.
Ribes Jean-Claude
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