Problems concerning the radio emission from Jupiter observed by ULYSSES after encounter.

Details Problems concerning the radio emission from Jupiter observed by ULYSSES after encounter. Problems concerning the radio emission from Jupiter observed by ULYSSES after encounter.

Sep 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...301..903b&link_type=abstract

Astronomy and Astrophysics, v.301, p.903

Astronomy and Astrophysics

Astrophysics

5

Jupiter, Radio Sources: Solar System, Space Vehicle

Scientific paper

Radio observations of Jupiter, made by the hi-band receiver of the Ulysses Unified Radio and Plasma (URAP) experiment before encounter, are generally consistent with observations of Jupiter made by the Voyager Planetary Radio Astronomy (PRA) experiment. After encounter, however, presumably due to the effects of beaming towards the extreme southerly latitude of the spacecraft, the character of the radio emission observed by URAP is apparently quite different and several new features have been found. The polarization and spectral characteristics of this after encounter emission are reviewed for 230 planetary rotations (400==15) or low magnetic latitudes (L=<10). These two possible source locations are discussed with regard to the characteristics of HOM-type events observed after encounter at CMLs close to 290deg and, to a lesser extent, close to 100deg. It is shown, from geometrical considerations, that a CMI emission cone of half-angle about 20deg on L-shell ~7.5, corresponding to an invariant latitude ~69deg, could radiate LH polarized emission from the southern hemisphere towards the spacecraft, at a given frequency, both before and after the Ulysses encounter. RH emission, from similar cones on the same L-shell in the northern hemisphere, could only be received before encounter, however; consistent with observations. The alternative possibility of a larger emission cone angle at higher magnitude latitudes is also considered. In this case there is no unique value for the emission cone angle but a minimum angle of about 50deg can be inferred which is representative of the geometry for all larger cones. It is implicit, however, that in this latter case some LH emission must come over the southern magnetic pole of Jupiter to reach the spacecraft after encounter.

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