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Author: WU-F-M; GANGOPADHYAY-P; JUDGE-D-L
Authors Abstract: N
Title: PIONEER-10 ULTRAVIOLET PHOTOMETER OBSERVATIONS OF JOVIAN UV
EMISSION IN 1973
Source: JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, vol. 100,
issue A3, (MAR 1, 1995) : pp. 3481-3493.
Abstract: The Pioneer 10 ultraviolet measurements obtained during the
Jupiter encounter in 1973 have been further examined by using
improved data handling and analysis techniques. The Pioneer 10
observations of Jupiter and its satellites during the encounter
have been carefully reviewed in order to improve our
understanding of the morphology of the To plasma torus and
Jupiter's upper atmosphere and to investigate the possible
existence of other emission source such as Europa. In addition,
the morphology of Io's bimodal torus observed during the Pioneer
10 encounter has been compared with the Voyager observations
obtained approximately 6 years after the Pioneer 10 flyby and
significant differences in the torus characteristics are found.
The To torus in 1973 was more similar to the 1992 Ulysses
observations of a longitudinally asymmetric ring than to the
complete ring observed by Voyager. Pioneer 10 observed a
significantly dimmer Io torus and Jupiter upper atmosphere in
the EUV compared to the Voyager observations. Apart from the
torus and Jupiter, Pioneer 10 observed additional emissions
which have been attributed to Io itself. Three distinct
possibilities have been discussed to explain these additional
emissions. The most likely is that Pioneer 10 observed
volcanism on Io. There is also evidence of Pioneer 10 observing
emissions from Europa. The present analysis clearly shows that
the Jovian system in 1973 was significantly different from that
observed in 1979.
English Abstract: Y
Pub. Type: ARTICLE
Subject Cat: LE: GEOSCIENCES. BU: ASTRONOMY AND ASTROPHYSICS. QQ:
METEOROLOGY AND ATMOSPHERIC SCIENCES.
ISI Order #: QL214 (For ordering reprints from ISI)