Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....72..148d&link_type=abstract
Astronomy and Astrophysics, vol. 72, no. 1-2, Feb. 1979, p. 148-160.
Astronomy and Astrophysics
Astronomy
13
Jupiter Atmosphere, Planetary Radiation, Radiation Belts, Radio Emission, Ammonia, Decimeter Waves, Pioneer 10 Space Probe, Planetary Mapping, Radio Astronomy, Thermal Radiation, Maps, Jupiter, Atmosphere, Radioemissions, Pioneer 10, Wavelengths, Radiation, Flux, Thermal Properties, Ammonia, Mixing, Limbs, Darkening
Scientific paper
Maps and stripscans of the radio emission from Jupiter were made during the Pioneer 10 flyby in December 1973 at wavelengths of 6 cm, 21 cm, and 50 cm using the Westerbork telescope in the Netherlands. With this instrument the disk of the planet was resolved at 6 and 21 cm. The pictures are averaged over 15 deg of Jovian longitude. At 21 cm the stripscans clearly show the existence of a 'hot region' in the radiation belts at a System III longitude (1965.0) of 255 + or - 10 deg. Its flux is about 9% of the total nonthermal flux, and it has a volume emissivity enhanced by a factor of about 1.6 with respect to the general radiation belts. The temperature of the thermal disk at 21 cm appears to be 290 + or - 20 K. This is likely due to a high ammonia mixing ratio in the atmosphere, a factor of 4-5 larger than the expected solar value of 0.00015.
Dames A. C. H.
de Pater Imke
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